Question

part d (4 of 7)
2 tries left
after a power stroke, the myosin head must detach from actin before another power stroke can occur. what causes cross - bridge detachment?
○ atp binds to the myosin head.
○ acetylcholine binds to receptors in the junctional folds of the sarcolemma.
○ calcium ions bind to troponin.
○ adp and inorganic phosphate are bound to the myosin head.

Explanation:

In muscle contraction, cross - bridge detachment occurs when ATP binds to the myosin head. This binding changes the conformation of the myosin head, allowing it to detach from actin. Acetylcholine binding to receptors in the junctional folds of the sarcolemma initiates muscle contraction, calcium ions binding to troponin exposes myosin - binding sites on actin, and ADP and inorganic phosphate bound to the myosin head are involved in the power - stroke process, not detachment.

Answer:

ATP binds to the myosin head.