Which change occurs when a neuron generates an action potential?
Correct answer: B. Sodium ions rapidly enter through open channels
- A. The membrane becomes temporarily more negative inside
- B. Sodium ions rapidly enter through open channels
- C. Potassium ions stop moving across the membrane
- D. The myelin sheath releases neurotransmitter molecules
Explanation
An action potential begins with rapid opening of voltage-gated sodium channels, allowing sodium to enter the neuron and depolarize its membrane. Potassium movement mainly helps restore the resting membrane potential, while myelin does not release neurotransmitters.
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About Nervous System and Special Senses
The nervous system covers neurons, neuroglia, nerve impulses, synapses, reflex arcs, and the organization of the central and peripheral nervous systems. It also explains the autonomic divisions and the receptors and pathways for vision, hearing, balance, taste and smell, distinguishing sensory reception from conscious perception.
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