Which function is associated with central neuronal nicotinic receptors?

Which function is associated with central neuronal nicotinic receptors?

• A. Muscle contraction
• B. Gastrointestinal secretion
• C. Transmitter release
• D. Heart rate modulation

Answer: (C)

Central neuronal nicotinic receptors are ligand-gated ion channels on CNS neurons. When acetylcholine or nicotine binds, these channels open and allow cations to flow in, depolarizing the neuron. In presynaptic terminals, this depolarization often triggers Ca2+ entry, which promotes vesicle fusion and the release of neurotransmitters. So, the primary function tied to these receptors is the modulation of transmitter release, shaping how signals are transmitted and integrated in neural circuits. This differs from muscle contraction at the neuromuscular junction, which involves peripheral nicotinic receptors, and from heart rate or GI secretion, which are driven by other receptors and pathways.

Central neuronal nicotinic receptors are ligand-gated ion channels on CNS neurons. When acetylcholine or nicotine binds, these channels open and allow cations to flow in, depolarizing the neuron. In presynaptic terminals, this depolarization often triggers Ca2+ entry, which promotes vesicle fusion and the release of neurotransmitters. So, the primary function tied to these receptors is the modulation of transmitter release, shaping how signals are transmitted and integrated in neural circuits. This differs from muscle contraction at the neuromuscular junction, which involves peripheral nicotinic receptors, and from heart rate or GI secretion, which are driven by other receptors and pathways.