Muscle contraction is caused due to the stimulus generated at the neuromuscular junctions. This causes the release of the neurotransmitter acetylcholine at the nerve endings. This causes the generation of the action potential for the conduction of the impulses by the movement of the ions. The second step involves the binding of the calcium ions with the actin filaments. The third step includes binding of myosin head to the actin. The fourth step includes the movement of the action over the myosin filaments with the energy released from ATP with the pulling of the filaments apart.

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Chapter 29, Problem 6MCQ

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Muscle contraction is caused due to the stimulus generated at the neuromuscular junctions. This causes the release of the neurotransmitter acetylcholine at the nerve endings. This causes the generation of the action potential for the conduction of the impulses by the movement of the ions. The second step involves the binding of the calcium ions with the actin filaments. The third step includes binding of myosin head to the actin. The fourth step includes the movement of the action over the myosin filaments with the energy released from ATP with the pulling of the filaments apart.

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