Answer:
Nitrogen-fixing bacteria
Explanation:
What is contamination defined as?
Contamination is defined as the presence of the a constituent, impurity, or other undesirable element which spoils, corrupts, infects, renders unfit, or degrades a material, physicality, natural environment, workplace, or other structure.
Contamination can occur whether or not it is recognised, and it can become a problem if the impure chemical activities happening chemical reactions when mixed with the other chemicals or mixtures. Chemical reactions caused by an impurity can sometimes be beneficial, where in case the term "contaminant" can be replaced to "reactant" or "catalyst." An environmental contaminant can be chemical, biological, or physical in nature.
The term "contamination" is used in food chemistry and medicinal chemistry to describe harmful intrusions, like the presence of toxins or pathogens in food as well as pharmaceutical drugs. In biological sciences, the accidental emergence of "foreign" material can significantly distort the results of experiments involving small samples. When the contaminant is indeed a living microorganism, it can quickly multiply and overwhelm the sample, rendering it useless, as in contaminated cell culture lines.
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What is the formula for calculating population growth?
We subtract the original population from the population at Time 1 to determine the Population Growth (PG), then divide that number by the initial population and multiply by 100.
What formula do you use to determine growth rate?Calculating Year-Over-Year Growth Subtract the growth rate from a year ago from your current month's growth rate. The difference should then be divided by the total for the previous year. This growth rate can be expressed as a percentage by multiplying it by 100.
What is growth rate and how is it calculated?Growth Rate is calculated as (Ending Value - Beginning Value) – 1. A company's year-over-year (YoY) growth rate, for instance, would be 20% if its revenue rose from $100 million in 2020 to $120 million in 2021.
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restriction enzyme i recognizes a 4 bp restriction site. restriction enzyme ii recognizes a 6 bp restriction site. on average, how does the number of restriction sites recognized by enzyme i compare to the number recognized by enzyme ii?
Restriction enzyme Compared to enzyme II, I will have more restriction sites.
The base makeup and length of the recognition site determine how frequently a specific restriction site can be found in any DNA. For instance, a G base follows a C base in mammalian genomes significantly less frequently than would be predicted by chance. Therefore, mammalian DNA is less commonly cut by restriction endonucleases like Nru I than it is by DNA from bacterial sources with more randomly distributed bases. Nru I recognizes the sequence TCGCGA.
Additionally, as would be expected, 4 bp-long restriction sites will be more common than 6 bp-long restriction sites.
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What are the issue of genetically modified organism?
Typically, genetic engineering alters an organism in ways that wouldn't occur naturally. It is even prevalent for scientists to insert genes from another organism into an organism.
Genetic engineering increases the possibility of unexpected allergic reactions to such GMO foods. Another source of concern is the possibility of genetically modified foreign DNA trying to spread to non-GMO animals and plants. the ability of the GMO to escape as well as potentially introduce this same engineered genes into wild populations; this same persistence of the gene after GMO has been harvested; this same susceptibility of non-target organisms (e.g., insects that are not pests) to the gene product; the gene's stability; the reduction inside the spectrum of other plants, including loss of biodiversity; and the increased use of chemicals in agriculture. The environmental safety of GM crops varies greatly depending on local conditions.
GMOs are organisms (plants, animals, or microorganisms) that have their genetic material (DNA) has indeed been altered inside a way that does not occur naturally through mating and/or natural recombination. The technology is frequently referred to as "modern biotechnology" or "gene technology," and it is also referred to as "recombinant DNA technology" or "genetic engineering" at times. It enables the transfer of specific genes from one organism to another, as well as between unrelated species. Foods derived from or containing GM organisms are frequently referred to as GM foods.
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What are the 5 components of homeostasis?
The primary components responsible for the maintenance of homeostasis can be categorized as stimulus, receptor, control center, effector and feedback mechanism.
Change
Changes occur constantly in and around the cells of living systems. A change is anything that requires a cell to react, such as a change in temperature, pressure or chemical composition inside or surrounding the cell.
Receptor :Once a change occurs, it’s the receptors job to detect the change and alert the proper control center to counteract it, returning the cell and the overall system to a balanced state -- homeostasis.
Control Center
As the control center receives impulses from its remote receptors, it sends commands to the effector to counteract the change in the environment. Using the same example, the medulla oblongata commands the effector -- the heart in this case -- to slow its pulse. Control centers are located in the brain.
Effector
The effector acts on the impulses from its specific command center, counteracting the change and returning the internal and external cell environment to a balanced state. Effectors are the physical change agents such as the heart, organs and fluids of the body -- the workhorses of homeostasis.
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All of the following systems contain organs that make up the contents of the abdominal cavity, EXCEPT:
Organs that make the contents of a abdominal cavity are found in the limbic system.
The stomach, the jejunum and ileum of the small intestine, the colon of the large intestine, the liver, the spleen, the gallbladder, the pancreatic, the uterus, the oviducts, the ovaries, the kidneys, the renal pelvis, the bladder, and many blood vessels are all located in the abdomen (arteries and veins). Esophagus, small intestine, colon (big intestine), and stomach are regarded as hollow organs. Solid organ damage The remaining cells in the abdominal wall are referred to as solid organs. The spleen, spleen, pancreas, liver, kidney, and adrenal glands are examples of solid organs. The majority of the digestive system, the liver, the pancreas, the spleen, the kidney, and the adrenal glands that are positioned above the kidneys are all located in the abdominal cavity.
(All of the following systems contain organs that make up the contents of the abdominal cavity EXCEPT:
A. the digestive system
B. the urinary system
C. the genitourinary system
D. the limbic system)
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What four features are shared by all cells ?
The rate, or speed, at which the number of organisms in a population increases.
A. Growth rate
B. Carrying capacity
C. Life expectancy
D. Greenhouse effect
The option (b) is correct- Growth rate.
What is growth rate?
The rate—or speed—at which an organism population grows in size. The amount of time in the space between the points of time can be determined by dividing the change in the number of organisms from one point in time to another.
What is carrying capacity ?
The typical population size of a species in a given habitat is referred to as carrying capacity. Environmental elements including sufficient food, shelter, water, and mates are able to control the population number of the species.
Therefore, the option (b) is correct- Growth rate.
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what are Artificial photosynthesis in laboratory tools
Answer:
Artificial photosynthesis is the process of using synthetic materials and processes to replicate the process of photosynthesis, which occurs naturally in plants and other photosynthetic organisms. In natural photosynthesis, solar energy is captured by photosynthetic pigments, such as chlorophyll, and used to convert carbon dioxide and water into oxygen and glucose (a type of sugar).
In laboratory tools, artificial photosynthesis can be achieved using a variety of techniques and materials. Some common approaches to artificial photosynthesis in the laboratory include:
Photocatalysis: This involves using a catalyst, such as titanium dioxide, to facilitate the conversion of carbon dioxide and water into oxygen and organic compounds, such as glucose, using light energy.
Artificial photosynthetic membranes: These are thin, synthetic membranes that are designed to mimic the structure and function of natural photosynthetic membranes, such as those found in chloroplasts. They can be used to capture and convert light energy into chemical energy, and can be modified to optimize the efficiency of the photosynthetic process.
Electrochemical cells: These are devices that use an electrical current to facilitate the conversion of carbon dioxide and water into oxygen and organic compounds, such as glucose. They can be designed to mimic the natural photosynthetic process, and can be modified to optimize the efficiency of the conversion.
Artificial photosynthesis in the laboratory can be used for a variety of purposes, including the production of renewable energy, the synthesis of chemicals and fuels, and the development of new materials.
What are the effects of Snowball and Napoleon's?
The effects of Snowball and Napoleon's are far-reaching and long-lasting. Snowball is the idealistic leader, who is passionate and driven to create a better life for the animals of Animal Farm.
What is snowball?Snowball is a type of debt repayment plan where a debtor repays their debt using a portion of their income, which is typically a percentage of the overall debt amount. The debtor then pays back the creditor in installments over a designated period of time.
His vision is to create a society of equal animals, where everyone works together and shares in the rewards. However, his plans are thwarted by Napoleon, the ruthless dictator who takes over after Snowball is driven out. Napoleon is a master manipulator who uses fear and intimidation to control the other animals.
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How do coral reefs change the environment?
Is atherosclerosis the same as Alzheimer's?
No, atherosclerosis is not the same as Alzheimer's.
The accumulation of lipids, cholesterol, and other chemicals in and on the artery walls is known as atherosclerosis. The accumulation is known as plaque. Atherosclerosis can constrict the arteries and obstruct blood flow. The plaque may rupture and cause a blood clot.
Endothelial dysfunction, the development of a lipid layer or fatty streak within the intima, migration of leukocytes and smooth muscle cells into the artery wall, the production of foam cells, and the breakdown of the extracellular matrix are the five main stages of atherosclerosis.
Alzheimer's disease is a brain ailment that gradually impairs thinking and memory abilities as well as the capacity to do even the most basic tasks. The majority of Alzheimer's patients have their initial symptoms later in life.
Alzheimer's disease is a degenerative neurologic condition that results in brain shrinkage and the death of brain cells. The most frequent cause of dementia, which is characterized by a steady deterioration in mental, behavioral, and social abilities and impairs a person's capacity for independent functioning, is Alzheimer's disease.
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All of the following are protective factors of the skin and its secretions EXCEPT A) keratin. B) tightly packed cells. C) lysozyme production.
All of the following are protective factors of the skin and its secretions EXCEPT pyocyanin production.
The Gram negative bacterium Pseudomonas aeruginosa produces and secretes a number of toxic compounds, including pyrocyanin (PCN). Pyocyanin is a blue secondary metabolite that turns red below pH 4.9 and has the ability to oxidize and reduce other molecules, killing microbes competing with P. The only gram-negative bacillus capable of producing the water-soluble pigment pyocyanin is Pseudomonas aeruginosa.
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How does antifreeze work in frogs?
Wood frogs have an extremely unique adaption that allows them to survive even if as much as 65 percent of the water in their bodies freezes throughout the winter.
Wood frogs, in contrast to the majority of other species of frogs, do not need to remain submerged in water or below the frost line in order to survive. Instead, their bodies manufacture an antifreeze, which they then either superload or concentrate in certain organs. The glucose acts as an antifreeze, preventing the formation of ice crystals that could be harmful to the wood frog. Because of this adaption, wood frogs can now be found in Alaska and even further north!
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Can you live a normal life with glaucoma?
Even though those who have glaucoma may need to adapt, you don't have to let the disease restrict your life. Most people are capable of leading active, happy lives. However, managing glaucoma may necessitate more frequent visits to your eye care team and medication compliance.
How long do glaucoma sufferers live?There are no extensive population-based studies on the lifespan of glaucoma patients. On the other hand, a cross-sectional analysis determined that white patients with chronic open angle glaucoma have an average life expectancy of about 12.8 years.
Is glaucoma a typical ageing symptom?Typical Age-Related Eye Issues Presbyopia, glaucoma, dry eyes, age-related macular degeneration, cataracts, and temporal arteritis are a few common age-related eye conditions.
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What is a good argument for genetically modifying animals?
Genetic modification of farm animals can increase yield; for example, cows can be modified to produce so much milk for a similar size herd.
The vast majority of genetically engineered animals remain in the research stage, rather than being used for their intended purposes or being commercially available. The genetic engineering of animals had also increased dramatically in recent years, and the application of this technology brings with that as well ethical issues, among which connect to animal welfare — defined by World Organization for Animal Health as "the state of the animal…how a mammal is coping with conditions in which it lives". Genetically modified farm animals are used in large quantities to produce medicinally important products such as antibodies.
All interested parties, including veterinarians, must consider these issues to ensure that all parties seem to be aware of the ethical concerns at stake and can contribute meaningfully to the current debate over the creation and utilization of genetically engineered animals.
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What are the three steps of making proteins?
Every cell has a complex, tightly controlled mechanism that links genes to proteins. The first two main processes are transcription and translation. The combined effects of transcription and translation are referred to as gene expression.
How are proteins constructed?The principles of molecular biology, which provide the basis for all of the processes that take place in each and every cell in our body, are adhered to in the process of making proteins. The fundamental dogma states that information is transmitted via DNA, RNA, and proteins in that sequence.
Transcription is the process of transcribing DNA to produce an RNA strand with a certain sequence. After that, RNA is translated to become proteins. .
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When Mendel crossed purple flowered pea plants with white flowered plants of the P generation what was the phenotypic ratio of the offspring?
homologous chromosomal pairs segregating separately during anaphase I. Mendel occasionally achieved a 3:1 phenotypic ratio by crossing two purple-flowered pea plants.
Segregation meant what, exactly?Segregation is the separation of individuals, historically based on race and/or gender. Segregation implies that people are physically separated in daily life, the workplace, and the enjoyment of civil rights.
Why is segregation problematic and what does it entail?Violence is more likely in certain neighborhoods because of residential segregation, which concentrates social and economic issues there. According to a recent study, areas with high levels of residential segregation may not be as prosperous as the rest of the area since those areas see slower increases in income and property values.
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Match the bacterial genetic element with the correct characteristic
a. chromosome-- nonessential genes
b.plasmid-- linear, single-stranded DNA
c.chromosome-- linear, double stranded DNA
d.plasmid--nonessential genes
Small, circular, double-stranded DNA molecules called plasmids exist separately from a cell's chromosomal DNA. It contains non-essential genes.
Extrachromosomal DNA molecules are known as plasmids. They are compact, spherical, and capable of independent reproduction. Chromosome DNA is not in charge of plasmid replication. Most often, they are found in bacteria. Yeast and plants are examples of eukaryotes that contain plasmids. Plasmids are not necessary and are extrachromosomal. They are helpful but may not be found in every member of the species. The same plasmid can exist in various species and be passed from one to the next because it is not a component of the genome. Each daughter cell has a copy of the plasmid since plasmids have their own origin of replication (ORI) and proliferate with the cell.
Hence, plasmid of bacteria is extrachromosomal DNA with non essential gene.
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What is a difference in the same trait called?
Every person has a single gene with two copies, or alleles. Homozygotes are those who share the same alleles. They are known as heterozygotes when they differ. Blue eyes, for example, are a trait that homozygotes code for.
A codominant trait is what?A characteristic brought about by an allele that expresses itself separately and equally to the other. Supplement. A person with blood type AB has one allele for blood type A and another for blood type B, which is an example of a codominant trait.
What does the term "contrasting trait" mean?A trait is any physical characteristic, such as height, shape, or color. Two forms typically represent a trait. These two forms are referred to as having contrasting traits when they are in opposition to one another. Tall and dwarf, for instance, are two opposites in terms of height.
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Is a chromatid a homologous pair?
No, a chromatid is not a homologous pair because a chromatid is one of the two identical halves of a chromosome.
The bivalent is a structure which is formed by a pair of synapsed chromosomes in the pachytene stage of prophase I of meiosis I. Each bivalent consists of one pair of homologous chromosomes. Each of these homologous chromosomes have two sister chromatids attached at the centromere.
At meiosis, each of the homologous chromosomes is comprised of two identical chromatids joined together by a common kinetochore (centromere). The identical chromatids are specifically called sister chromatids to distinguish them from the so-called non-sister chromatids. Sister chromatids are genetically identical, whereas homologous chromosomes are composed of two different chromosomes that are not genetically identical despite containing the same sets of genes.
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Neisseria meningitidis, which causes meningococcal meningitis, is capable of triggering sporadic disease outbreaks by which of the following methods?
A) efficient spreading in the host by breaking down blood clots
B) capsular switching
C) hides from the immune system inside neurons
D) infecting compromised hosts
E) mutations due to utilization of reverse transcriptase
Neisseria meningitidis is capable of triggering sporadic disease outbreaks by B) capsular switching,
What is Neisseria meningitidis and how does it spread?
Neisseria meningitidis is an encapsulated, aerobic, gram-negative diplococcus bacteria that can cause meningitis and other meningococcal diseases. Neisseria meningitidis is the most common cause of sepsis and meningitis is in newborns, young children, and adolescents, and results in significant morbidity and mortality globally.
One in ten persons are carriers of the Neisseria meningitidis bacteria in their throat and back of nose without being unwell. By exchanging lung and throat secretions such as saliva or spit, humans can transmit the Neisseria meningitidis bacteria to others. In most cases, close or prolonged contact such as kissing or coughing is required to spread these microorganisms. The bacteria cannot be acquired by inadvertent touch or by breathing air that has been exposed to a person who has a meningococcal disease.
The main determinant determining the virulence of Neisseria meningitidis is its polysaccharide capsule. Serogroup specificity and consequent pathogenicity of the bacteria are caused by the structure of the capsular polysaccharides. Neisseria meningitidis can modify its capsular phenotype through a process called capsular switching. Neisseria meningitidis bacteria acquire a new capsule operon by horizontal gene transfer in order to create strains with higher virulence.
Therefore, Neisseria meningitidis is capable of triggering sporadic disease outbreaks by B) capsular switching,
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a scientist studying a group of five species was particularly interested in a specific gene. after sequencing the gene for all five species, she compiled the following data to help her compare species a to the other four. based on this data, what did she conclude?
The correct answer is species A is most closely related to species D, and it is most distantly related to species E.
What is gene sequencing?
A technique carried out in a lab to map the complete genetic composition of a particular organism or cell type. Finding alterations in specific regions of the genome is possible with this technique.
As species D shares 14 amino acids with species A it is the most closely related and as species E shares only 1 amino acid with species A it is the most distantly related species.
Therefore the answer is species D and E.
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The image shows an energy pyramid for a grassland ecosystem.
Photo Showing the Energy pyramid of Grassland ecosystem. With the apex consumer at the top, followed by the secondary consumer, primary consumer, and producers at the Bottom.
The apex consumer level of this ecosystem contains between 500 and 1000 kilograms of biomass. Which statement best describes the amount of biomass at the level of the primary producers?
A.
less than 50 kilograms, because producers contain less than ten percent of the biomass of apex consumers
B.
between 50 and 500 kilograms, because apex consumers have a moderately greater biomass than producers have
C.
between 500 and 1000 kilograms, because there are similar amounts of biomass at the producer and apex consumer levels of an ecosystem
D.
much larger than 1000 kilograms, because a very high biomass of producers is required to support a smaller biomass of apex consumers
For apex consumers' biomass to range from 500 to 1000 kilograms, the food chain's producers must have significantly larger biomass than that of 1000 kilograms.
Which of the following best sums up the biomass production at the level of primary producers? Energy is transmitted from one organism to another when they consume other species.Only 10% of the available energy is transferred to species at the next higher trophic level, according to the 10% law of energy transfer.The apex or top consumer in this scenario has 500–1000 kg of biomass.The producers in the food chain must have significantly more biomass than 1000 kilograms in order to support the 500 to 1000 kilograms of biomass at the apex consumers.This is so that energy can be transferred from one trophic level to another without losing the majority of it as heat.To learn more about biomass refer
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~Use the graph below, to answer the question.
12. How does adding a catalyst affect the activation energy of this chemical reaction?
A. Increases the activation energy, increases rate of the chemical reaction
B. Decreases the activation energy, decreases rate of the reaction
C. Decreases the activation energy, increases the rate of the reaction
D. Increases the activation energy, decreases the rate of reaction
According to the graph below, the addition of a catalyst decreases the activation energy and increases the rate of the reaction (Option C).
What is a biological catalyst molecule?A biological catalyst molecule is any structure such as an enzyme i.e. a protein, that is able to lower the activation energy of the reaction, thereby enhancing the progression from reactants to predict in the unit of time.
Therefore, with this data, we can see that a biological catalyst molecule can lower the activation energy of a chemical reaction and thus increase the amount of products.
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FILL IN THE BLANK. protein is generally not found in the urine because __________.
Answer:
protein molecules are too large for the filters.
why is newtons cradle (newtons balls) described as an “almost-ideal” closed system? explain your reasoning in 1 to 2 sentences.
The reason that newtons cradle (newtons balls) described as an “almost-ideal” closed system is because Due to the little forces that are exerting themselves onto it, it is a closed system. solely air resistance and gravity
What is the newtons cradle about?
Tn regards to the above case, it is a system that is almost completely isolated from its surroundings, Newton's cradle is referred to be an almost ideal closed system.
This indicates that the system is largely self-contained and does not interact with the environment to exchange matter or energy.
In Newton's cradle, a set of metal balls are suspended from a frame as the system. The other balls swing back and forth when one ball is pushed back and released, striking them in the process.
Therefore, The balls do not gain or lose energy during the impact since this motion is nearly completely elastic. The system is therefore almost closed and does not exchange energy with its surroundings.
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the elimination of severlal steps in the elisa could be accomplished if the primary antibody was made into an enzymre onjugate. why is this generally not done? what can cause a flase positive in an elisa
It would be necessary to purify and conjugate the IgG for each antigen.It would be too time-consuming and expensive to do this.
What does "effective cost" mean?An activity has good value for the money spent if it is cost-effective:Purchasing a new expensive computer when all you need to do is store your photos wouldn't be cost-effective.Ailment. Costs & costs.
Is it efficient or cost-effective?The best performance or functionality with the least amount of effort and time wasted.In contrast to cost efficiency, which focuses on completing tasks with the least amount of waste and the most effective use of resources, cost effectiveness is more concerned with completing tasks at all.
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Select ALL of the TRUE statements regarding protists. Euglenozoa are organisms that possess chloroplasts and move via flagella or an undulating membrane. Protists typically inhabit aquatic environments, including freshwater and marine environments. Species of dinoflagellates are responsible for much of the phosphorescence seen in ocean waters at night Protists are unicellular prokaryotes which generally lack a cell wall. Trichonympha are obligate mutualism of wood eating insects such as termites. 2 points
TRUE. Chloroplast-containing creatures called euglenozoa move with the help of flagella or an oscillating membrane.
Protists often live in freshwater and marine habitats that are submerged in water. A significant portion of the phosphorescence observed in sea water at night is caused by dinoflagellate species. Prokaryotes that are unicellular and lack a cell wall are known as protozoa.Chloroplast-containing creatures called euglenozoa move with the help of flagella or an oscillating membrane. Trichonympha are obligatory mutualists of termites and other wood-eating insects. In some Euglenozoa, including many trypanosomes, the emerging flagellum extends the whole lengths of the cell and is physically connected to the cell membrane by a "undulating membrane," which is essentially a link between the flagellar membrane and the cell's outer membrane. Flagellated protists belonging to the monophyletic class Euglenozoa include free-living, symbiotic, & parasitic species.
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Muscles make adjustments to maintain _____ from the force of gravity.
To keep posture and balance while resisting the pull of gravity, muscles change.
Contractibility serves as their primary purpose. Movement is made possible by muscles that are affixed to bones, internal organs, or blood vessels. Muscle contraction produces the majority of body movement. Cardiac, smooth, and muscle tissue tissue are the three types. Myocytes are found within the walls of the atrium, have a striped (striated) look, and thus are controlled by an automatic mechanism. That kind of elastic tissue makes up all of the muscles (sort of like the material in a rubber band). Each muscle is made up of tens of thousands or even Thousands of microscopic fibres. The average human body has 600 muscles. Skeletal and smooth muscles make up the three primary forms of muscle.
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