Question

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.

Answer 1

I think the the best answer for this question would be

D. Actin and myosin are completely overlapped.

Hope this helps:)

Answer 2

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.