Muscle contraction is directly caused by
A)structural changes in actin.
B)structural changes in myosin.
C)thick and thin filaments sliding past each other.
D)structural changes in the Z disk.
E)None of the above is correct.

Question

Quizplus · Accepted Answer

Muscle contraction occurs when the thick and thin filaments slide past each other, which is caused by the binding of myosin heads to actin filaments and subsequent power strokes. Structural changes in actin, myosin, or the Z disk can affect the strength and efficiency of muscle contraction, but they are not the direct cause of contraction itself.

Muscle Contraction Is Directly Caused by