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# Review + Muscle Fatigue + Respiration Questions -> Answer to prep for introduction for the lab |
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1. What are motor units? Why do only recruit some motor units instead of using all our muscle fibers? |
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* A motor unit is a group of muscle fibers that are attached to a neuron. |
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* this allows for cycling of motor fibers so that they do not get worn out as much |
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2. What is the difference between aerobic and anaerobic respiration? (both inputs and outputs) |
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* both : have glucose |
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* aerobic : has air for input; makes a ton of atp |
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* anerobic : does not have air for input; has atp and lactic acid |
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3. Describe the lactic acid cycle and the cori cycle. Why do we have/need each of these? |
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* the cori cycle is the same as the lactic acid cycle. The process takes lactate and converts it back into glucose but uses a bunch of atp in the liver in order to make a little atp in the muscle. The two work together because they have similar inputs oand outputs that work in a loop |
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4. Describe muscle fatigue, why it occurs, and what happens to humans when fatigued. |
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* muslce fatigue is the process in which a muscle is no longer able to fullfull its duties and then stops preforming said action. In humans this often is due to a lack of oxygen which will prevent the muscle from preforming cellular respiration |
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5. Compare and contrast type I, type IIa, and type IIx muscle fibers. |
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| | type I | type IIa | type IIx | |
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|--------------------- | ------ | -------- | -------- | |
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| structural metabolic | small muscle diameter. lots of oxygen. | largest diameter, highly valscular + high density of mitochondirea -> aerobic | intermediate diameter,l white/paleish pink, little valcularity, almost no aerobic respiration | |
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| metabolic | longer to ccontract, myoglobin (oxygen) | glycolysis cast contraction -> moderate fatigue resistance | castest contractility, uses atp very quickly, fast but super low fatigue resistance | |
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| function | low power (first to be used) posture etc | moderate power 2nd used, walking/sprinting (longer distances) | 3rd used, highest power strong but short fatigue resistace |
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6. Describe the effect of different types of exercies on muscle tone and function |
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* as an exercise increases in utilization the types of muscles that are recuited for that activity will further develop because they are more needed |
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