Which energy molecule is directly hydrolyzed by myosin ATPase to power muscle contraction and cross-bridge cycling?
Show answer and explanation
Correct answer: ATP
ATP is hydrolyzed by the myosin ATPase on the myosin head, providing the energy required for the power stroke and detachment in each cross-bridge cycle.
Keep practicing
More Muscle Physiology and Contraction questions
- What structural arrangement at the neuromuscular junction ensures that one motor neuron can control multiple muscle fibers simultaneously?
- Which of the following correctly describes the sequence of events in excitation–contraction coupling in skeletal muscle, from membrane exci…
- During muscle relaxation after a contraction, which mechanism primarily reduces cytosolic Ca²⁺ concentration to stop contraction?
- Which band(s) of the sarcomere shorten during contraction as thin and thick filaments slide past each other?
- Which structure in the muscle fiber ensures rapid propagation of action potentials into the interior of the fiber to trigger Ca²⁺ release f…
- In isometric muscle contraction, which of the following is true?