Question

multiple select question select all that apply the myosin head contains two binding sites for: (select all that apply.) atp troponin actin ca++ myosin

Explanation:

Myosin heads have a binding - site for ATP which provides energy for muscle contraction and a binding - site for actin to form cross - bridges during muscle contraction. Troponin binds to tropomyosin and is involved in the regulation of muscle contraction but not to myosin heads directly. Calcium ions ($Ca^{++}$) bind to troponin, not myosin heads. Myosin does not bind to itself at the head in the context of these binding sites relevant to muscle contraction.

Answer:

A. ATP
C. actin