What are the steps of muscle stimulation by a nerve impulse?

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Study for the Anatomy and Physiology Muscular System Test. Prepare with flashcards and multiple choice questions; each question provides hints and explanations. Get ready to excel in your exam!

Multiple Choice

What are the steps of muscle stimulation by a nerve impulse?

Explanation:
The signal begins at the motor neuron and the first essential step is the release of acetylcholine into the neuromuscular junction. This neurotransmitter crosses the synapse and binds to receptors on the muscle fiber’s motor end plate, creating a depolarizing current that starts an action potential in the muscle. That electrical signal then travels into the muscle via the T-tubules and prompts the sarcoplasmic reticulum to release calcium. The rise in Ca2+ enables cross-bridge interaction between actin and myosin, leading to contraction. So, releasing acetylcholine is the initial trigger that sets the entire sequence in motion; the other steps occur after it.

The signal begins at the motor neuron and the first essential step is the release of acetylcholine into the neuromuscular junction. This neurotransmitter crosses the synapse and binds to receptors on the muscle fiber’s motor end plate, creating a depolarizing current that starts an action potential in the muscle. That electrical signal then travels into the muscle via the T-tubules and prompts the sarcoplasmic reticulum to release calcium. The rise in Ca2+ enables cross-bridge interaction between actin and myosin, leading to contraction. So, releasing acetylcholine is the initial trigger that sets the entire sequence in motion; the other steps occur after it.

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