7 a) When a muscle is stimulated, do all motor units fire? Why or why not? b) Ex

Question

7 a) When a muscle is stimulated, do all motor units fire? Why or why not?
b) Explain how the force of contraction changes with recruitment
c) With continued recruitment, is there a point at which there is no further increase in force? If so, when is there no further increase in the amount of force the muscle generates?


11.. These questions involve an experiment we did in lab. There was no real data to record, more just to see the effects various stimulations, voltages, and varying the frequencies has on a muscle.
a) Explain what happened to active force as the "voltage" increased? As it decreased?
b) Explain what happened to active force at the "rate of stimulation" increased? As it decreased?
c) You increased/decreased voltage in the experiment. In the human body what is equivalent to "voltage"? How does it vary during muscle contraction?
d) You also varied the frequency of stimulation. What is the human body equivalent to that "rate of stimulation"? How does it vary during muscle contraction?
e) Putting it all together, what two things does the human body adjust to maintain a smooth contraction as the weight it bears varies?


15) What event(s) is(are) occurring within the muscle during the lag, or latent, period?

Explanation / Answer

7) Yes, muscle contractions are a all or nothing stimulation. The more a muscle is exercised to a certain motion, it gains more neurological recruitment because the body is learning how to deal with the activity and adapting to its work load. With continued recruitment, there a point at which most athletes call a "plateau" meaning there is no further increase in force the muscle produces, but this can be over come by changing the frequency of the activity. There is only no further increase in force at the moment the muscle cannot exert more force during an action but in the future your muscle will be able to do it next time with a bit more ease.

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