Question

question 9 (1 point) when a muscle fiber contracts, __ and __ would narrow in size. i - band; a band h band; i band z - line; zone of overlap h band; a band question 10 (1 point) when is atp needed throughout the process of cross - bridge formation and power stroke? when myosin head binds to active site to create a cross - bridge release myosin head from actin and return to original position when troponin rolls away to reveal active site when myosin head pivots toward m - line

Explanation:

In muscle contraction, I - band and H - band narrow. ATP is needed when myosin head binds to actin's active site for cross - bridge formation.

Answer:

Question 9: I - band; H - band
Question 10: when myosin head binds to active site to create a cross - bridge