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Need help with exercise physiology/neuro-muscular questions

Posted: Wed Mar 21, 2012 2:06 am
Hello all, I am working on an assignment for my neuromuscular adaptations to strength training class. I have all sets of questions complete but this one with the multiple parts is really troubling me.
I have to develop an argument against these because they are supposed to be untrue. I need understand the specific mechanisms concepts, and terms, rather than generalizations descriptions to refute these. Any input that can help me get a better insight to these questions would be greatly appreciated.

a.) Having to build more ATP every time you use it is inefficient. Why not allow more to be stored in the sarcoplasm so that a greater amount is present immediately?
b.) You also made it so that ATP supply never runs very low. What purpose does having to resynthesize ATP at its rate of use in order to keep levels relatively high at all times serve?
c.) During a sustained MVC, you have built a feature into the nervous system that reduces frequency of activation (rate coding) in motor units that are activated. Why would you want reduced stimulation at a time when you are looking for a maximal effort?
d.) When your humans move rapidly and/or must exert high levels of force, they cannot simply recruit the fibers that are most appropriate for the task (fast-twitch fibers). What purpose does having to recruit slow-twitch fibers for these tasks serve?
e.) Some of your less intelligent humans tend to spew a lot of nonsense from their mouths that appears to distract some of your more intelligent ones. You have made the eye with a lid that can be closed in circumstances where it is not desirable to see something in the line of sight. Why don’t you have a similar mechanism for the ear?
f.) The longitudinal arrangement of muscle fibers allows all of the force to be transmitted along the long axis of the fiber. What possible reason could there be to have angled (pennate) attachments in other muscles? Surely, both speed and force will be compromised.
g.) Why use third-class levers that are mechanically disadvantaged with respect to developing force?
h.) Why didn’t you build in a restrictor that prevents membrane potential from ever surpassing (i.e., becoming more negative than) that which is required at rest (e.g., -70 mV)?

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3.) Motor Unit A has an innervation ratio (motor neuron to fibers) of 1 to 10. Motor Unit B contains muscle fibers that innervate the same muscle as Motor Unit A. Motor Unit C contains fibers that innervate an antagonist of the muscle innervated by Motor Units A and B. Answer the following about these motor units:

EPSP > IPSP in Motor Units A, B and C simultaneously. What phenomenon does this represent? Name two purposes of this activation strategy.

Re: Need help with exercise physiology/neuro-muscular questi

Posted: Wed Mar 21, 2012 7:07 am
by robertscott
I've got a couple of essays for uni someone could write for me too if they want

Re: Need help with exercise physiology/neuro-muscular questi

Posted: Wed Mar 21, 2012 10:58 am
by Dub
Nope. Too scientific for me. I think it goes beyond practical to know stuff this deep. I ain't a scientific researcher, so I just settle with the knowledge I have now. Lot of that is jibberish to me due to language barrier, and I have trouble understanding the assignement. If the point is to develope an argument against these things, why are there so many questions between the lines? And what's with the eye-ear question? Is the assigment seirously asking why don't we have muscles to block or focus our hearing? I quess you could use your arms or something, does that count?

Anyway, too off the charts for me.

Re: Need help with exercise physiology/neuro-muscular questi

Posted: Wed Mar 21, 2012 4:16 pm
by stuward
It looks to me like these are questions designed to actually get you to think about the material, instead of looking it up in a book. You may actually have to do some work.

Re: Need help with exercise physiology/neuro-muscular questi

Posted: Wed Mar 21, 2012 4:16 pm
by KenDowns
Jazz, is english your native language?