A motor nerve impulse reaches the neuromuscular junction of a skeletal muscle fibre. Which event occurs first?
Correct answer: B. Acetylcholine is released into the synaptic cleft
- A. Calcium binds to troponin
- B. Acetylcholine is released into the synaptic cleft
- C. Myosin detaches from actin
- D. The sarcomere returns to its resting length
Explanation
Arrival of the nerve impulse at the motor nerve ending causes release of acetylcholine into the synaptic cleft. Acetylcholine then stimulates the muscle fibre, leading to calcium release and binding to troponin. Myosin interaction with actin occurs after these steps.
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About Skeletal and Muscular Systems
The skeletal and muscular systems include bone structure, joints, cartilage, the axial and appendicular skeleton, and the roles of ligaments and tendons. They also cover skeletal muscle organization, the sliding filament mechanism, neuromuscular contraction, and common differences between voluntary skeletal muscle, cardiac muscle and smooth muscle.
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