Question

What is true about the

white muscle fibers

(A)Myoglobin content is high

(B)They have large number of mitochondria

(C)They depend on anaerobic process for

energy(D)They are adapted for slow

sustained activities
​

Answer 1

It's probably, A

Fast twitch fibers have a lower myoglobin and therefore lower oxygen content, which is why they do not appear reddish but rather bright. So they are also known as white muscle fibers. In contrast to the red fibers, they gain their energy anaerobically, which means without oxygen and mainly from the sugar glycogen.