Of those listed, which event occurs first following a depolarizing stimulus appl

Question

Of those listed, which event occurs first following a depolarizing stimulus applied to the presynaptic membrane of an axon terminal?

d. Synaptic vesicles fuse with the membrane.

2. After eating a large meal, which branch of your nervous system is activated?

a. Voltage-gated calcium channels in the membrane open. b.Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft. c. The postsynaptic cell produces an action potential.

d. Synaptic vesicles fuse with the membrane.

2. After eating a large meal, which branch of your nervous system is activated?

a. enteric b. sensory c. somatic (motor) d. sympathetic

Explanation / Answer

a. voltage gated calcium channels in the membrane open.

When the action potential reaches the terminal, it activates voltage-dependent calcium channels, allowing calcium ions to flow into theterminal. Neurotransmitters are later released into the synaptic cleft.

2. enteric nervous system (increase secretion ).

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