Which of the following occurs when an excitatory neurotransmitter binds to a nicotinic receptor? A)Voltage-gated Na⁺ channels open. B)Voltage-gated K⁺ channels open. C) Chemically gated Na⁺ channels open. D) Voltage-gated Cl^- channels open.

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Quizplus · Accepted Answer

Nicotinic receptors are ligand-gated ion channels, which means they are chemically (not voltage) gated. When an excitatory neurotransmitter binds to the nicotinic receptor, specifically the alpha subunit, it causes the channel to open, allowing Na+ ions to flow into the cell and K+ ions to flow out of the cell. This movement of ions depolarizes the membrane potential, which may trigger an action potential.

Which of the Following Occurs When an Excitatory Neurotransmitter Binds