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2.3 KiB
2.3 KiB
Review + Muscle Fatigue + Respiration Questions -> Answer to prep for introduction for the lab
- What are motor units? Why do only recruit some motor units instead of using all our muscle fibers?
- A motor unit is a group of muscle fibers that are attached to a neuron.
- this allows for cycling of motor fibers so that they do not get worn out as much
- What is the difference between aerobic and anaerobic respiration? (both inputs and outputs)
- both : have glucose
- aerobic : has air for input; makes a ton of atp
- anerobic : does not have air for input; has atp and lactic acid
- Describe the lactic acid cycle and the cori cycle. Why do we have/need each of these?
- 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
- Describe muscle fatigue, why it occurs, and what happens to humans when fatigued.
- 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
- Compare and contrast type I, type IIa, and type IIx muscle fibers.
type I | type IIa | type IIx | |
---|---|---|---|
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 |
metabolic | longer to ccontract, myoglobin (oxygen) | glycolysis cast contraction -> moderate fatigue resistance | castest contractility, uses atp very quickly, fast but super low fatigue resistance |
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 |
- Describe the effect of different types of exercies on muscle tone and function
- as an exercise increases in utilization the types of muscles that are recuited for that activity will further develop because they are more needed