At a chemical synapse, which event directly causes neurotransmitter release from the presynaptic terminal?
Correct answer: A. Entry of calcium ions into the terminal
- A. Entry of calcium ions into the terminal
- B. Exit of chloride ions from the terminal
- C. Breakdown of acetylcholine in the synaptic cleft
- D. Reuptake of neurotransmitter by the postsynaptic cell
Explanation
Arrival of an action potential opens voltage-gated calcium channels in the presynaptic terminal. Calcium entry triggers synaptic vesicles to fuse with the membrane and release neurotransmitter into the synaptic cleft.
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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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