Question

question 4 of 10 what is the next step in muscle contraction after the actin changes shape? a. myosin binds to actin. b. an atp molecule binds to the myosin. c. a calcium ion binds to actin d. myosin and actin slide past each other

Explanation:

In muscle contraction, after actin changes shape due to calcium - ion binding, the next step is that myosin binds to actin. This is part of the cross - bridge cycle. ATP binding to myosin occurs earlier in the cycle for myosin to be in a high - energy state and calcium ion binding to actin is what causes the shape change of actin in the first place. Myosin and actin sliding past each other happens after myosin binds to actin.

Answer:

A. Myosin binds to actin