What is happening during the process labeled A?
A)Myosin links to actin
B)Fresh ATP causes release of myosin
C)Power stroke
D)Calcium has caused the binding site on actin to be revealed

Question

What is happening during the process labeled A? 
A)Myosin links to actin 
B)Fresh ATP causes release of myosin 
C)Power stroke 
D)Calcium has caused the binding site on actin to be revealed

Quizplus · Accepted Answer

During process A, calcium has caused the binding site on actin to be revealed, allowing myosin to bind to actin and initiate muscle contraction. Myosin linkage to actin, power stroke, and ATP release occur during later stages of the contraction cycle.

What Is Happening During the Process Labeled A