Question

question 58
if the nerve impulse does not reach the required magnitude, only some of the muscle fibers will contract.
true
false

Explanation:

In muscle contraction, a nerve impulse must reach the threshold (required magnitude) to trigger an action potential. If it doesn't reach threshold, no muscle fibers in that motor unit contract (all - or - none principle for motor units). So the statement that only some contract is false.

Answer:

False