Question

1. when ______ molecules bind to actin, they undergo a \power stroke\ which results in muscle contraction. a) atp. b) tropomyosin. c) myosin. d) troponin.

Explanation:

Muscle contraction occurs when myosin molecules bind to actin and undergo a power - stroke. ATP provides the energy for this process. Tropomyosin and troponin are involved in regulating muscle contraction but do not directly cause the power - stroke upon binding to actin.

Answer:

C. myosin