What is common between the muscle fibers of extensor of human back and those of flight muscles of the birds which remain in flight for long periods of time ?
a. They are thinner , red colored
b, they are thicker and light colored .
c. they have abundant mitochondria .
d. they have well developed sarcoplasmic reticulum
e. they show rate of contractions for longer periods
f, They show fast stenous activity
g. They do not get fatigued early .
h. They get fatigued quickly .