Chapter 50, Problem 17TYK

The role of ATP in muscle contraction is to

1. a. form cross-bridges between thick filaments and thin filaments.
2. b. release the myosin head from actin when it binds and to provide energy when hydrolyzed to form myosin's high-energy form.
3. c. remove the tropomyosin−troponin complex from blocking the binding sites on actin.
4. d. bend the cross-bridge and pull the thick filaments toward the center of the sarcomere.