Suppose an action potential arrives at the axon terminal but the voltage-gated calcium channels at the terminal fail to open.What will most likely happen to the action potential? A) It will stop,because Ca²⁺ will not enter the presynaptic cell and the neurotransmitter will not be released. B) It will stop,because Ca²⁺ will not be available to act as a neurotransmitter in place of acetylcholine. C) It will continue,because Ca²⁺ will be released by an electrical method and the neurotransmitter will be released. D) It will continue,because although the neurotransmitter will not be released,Na⁺ and K⁺ will be released in the postsynaptic membrane. E) It will continue,because although Ca²⁺ will not be released,synaptic vesicles will use another method to fuse with the presynaptic membrane.

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Quizplus · Accepted Answer

If the voltage-gated calcium channels fail to open, calcium ions will not enter the presynaptic cell, which means that the neurotransmitter will not be released into the synaptic cleft. Without the release of the neurotransmitter, the action potential cannot continue to the postsynaptic membrane.

Suppose an Action Potential Arrives at the Axon Terminal but the Voltage-Gated