Which of the following describes the relationship between the type of metabolism used by skeletal muscle fiber and its resistance to fatigue?

Question

A. Muscle fibers that have a high glycolytic ability do not fatigue.

B. Muscle fibers with a high oxidative capacity have a high resistance to fatigue

C. Muscle fibers with a low oxidative capacity are resistant to fatigue

I know it’s not A. That is the fastest to fatigue. and I know it a type IIX.

B. I believe b can be type 1 and type. IIA both have a high oxidative capacity (most likely the answer)

C. I believe is also type IIX but can be wrong. ‘

Seeking explanation to answer. Thank you.

Answer 1

this is a slightly odd question, took me a couple of readins of it to understand (I think!) what the question's getting it.

So, take a look at option C and ask yourself the following question - if C was a muscle fiber phenotype, how would that work i.e how could it have a low oxidative capacity but be resistant to fatigue? The only way that could be possible was if it had some (currently unknown) different, non-oxidative mechanism that enabled it efficiently produce ATP, therefore not possible.

Of course, these intermediate fibers have greater fatigue resistance than the type IIX so it's possible that's what the question was getting at (can you tell I don't love the writing of this question?!)