Which describes step three of a muscle contraction?
A. The sarcomere lengthens.
B. The space between sarcomeres increases.
C. Actin and myosin are partially overlapped.
D. Actin and myosin are completely overlapped.
I think the correct answer would be D. Actin and myosin are completely overlapped would sum up the three steps of a muscle contraction. For it to happen, troponin and tropomysin should be moved in order to show the myosin-binding sites.
