Question

"Sudden lack of ATP after the contracted sarcomere
begins to relax" would result in
(1) No effect on muscle relaxation
(2) Inability of myosin heads to detach from actin
(3) Quick release of myosin from actin
(4) Binding of troponin to actin​

Answer 1

Answer:

3 is answer.....!!! ..

Answer 2

Answer:

Sudden lack of ATP after the contracted sarcomere begins to relax would result in the inability of myosin heads to detach from actin.

Explanation:

• The length of the sarcomere, the contractile unit of the muscle, is decreased during muscle contraction by an increase in the overlap between the thin and thick filaments, which uses ATP as energy.
• Myosin shifts into a high energy state bound to actin when ATP, which is linked to the myosin head, is hydrolyzed to ADP, forming a cross-bridge.
• Actin is moved toward the center of the sarcomere when ADP is released, causing the myosin head to transition to a low energy state.
• Myosin and actin are split apart upon the binding of a fresh ATP molecule.
• The myosin head will connect to actin once this ATP is hydrolyzed, but this time on a section of actin that is closer to the end of the sarcomere.
• Calcium and the regulatory proteins troponin and tropomyosin cooperate to regulate the myosin-actin connection.
• Myosin and actin can interact and cause muscle contraction when troponin binds to calcium and moves tropomyosin away from the myosin-binding site on actin.

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