Four of the five answers listed below are molecules that directly participate in muscle contraction within a muscle fiber. Select the exception.
A)acetylcholine
B)ATP
C)calcium
D)actin
E)myosin

Question

Quizplus · Accepted Answer

Acetylcholine is a neurotransmitter that binds to receptors on the muscle fiber to initiate the release of calcium ions, which in turn triggers muscle contraction. However, acetylcholine itself does not directly participate in muscle contraction within the muscle fiber. The other options (ATP, calcium, actin, and myosin) all play direct roles in muscle contraction.

Four of the Five Answers Listed Below Are Molecules That