Question

Step 11 of skeletal muscle contraction:__________.

A) Inorganic phosphate is released from myosin head pulls actin filaments (power stroke) toward the center of the sarcomere.
B) Phosphate and ADP form to make ATP which binds to the myosin head and causes cross-bridge to detach.
C) ATP breaks down into ADP and inorganic phosphate.
D) Myosin head resets for another cross-bridge cycle Myosin head binds to actin binding site. (Cross-bridge

Answer 1

The suitable option will be - B

B) Phosphate and ADP form to make ATP which binds to the myosin head and causes cross-bridge to detach.

Explanation:

Until step 11, skeletal muscle has already done cross-bridge and power stroke. ADP is released just after the power stroke. After that phosphate and ADP form a new ATP which gets bound to the myosin head.

Then at step 11, cross-bridge is released as a new ATP is bound to myosin head.

So, we can say that option B is correct.