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Of those listed, which event occurs first following a depolarizing stimulus applied to the presynaptic membrane of an axon terminal? A. Voltage-gated calcium channels in the membrane open. B. Synaptic vesicles fuse with the membrane. C. The postsynaptic cell produces an action potential. D. Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft.

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The correct option is (A) Voltage-gated calcium channels in the membrane open.

When the threshold value of membrane potential is crossed by depolarization it is called action potential. The threshold value is around -55mV.

When depolarization occurs following opening of calcium channels, ligand-gated channels open allowing neurotransmitters to enter the synaptic cleft. Post this, synaptic vesicles fuse with the membrane and the postsynaptic cell produces an action potential.

Synapse is of two types- chemical synapse and electrical synapse. Chemical synapse involves the use of neurotransmitters and electrical synapse involves the use of electrical signals. Transmission of signals through electrical synapses is much faster then chemical synapses.

Learn more about depolarization here: https://brainly.com/question/14692094

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