Question 1
Each myosin head has a binding site for
◦ actin only.
◦ calcium and ATP.
◦ actin and ATP.
◦ calcium only.
◦ ATP only.
Question 2
As ATP binds to the myosin head at the beginning of a muscle contraction cycle, the myosin head immediately
◦ releases actin.
◦ tightens its bond to actin.
◦ swivels.
◦ initiates binding with actin.