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When an action potential arrives at the presynaptic membrane, depolarization occurs, opening voltage-gated channels. this allows an influx of ca2+ ions that are needed to trigger the release of neurotransmitter into the synapse. if a calcium channel blocker, such as cadmium, is injected into the presynaptic cell, which explanation best describes cadmium's effect on the transmission of the impulse?

User Warrens
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Elevated cadmium levels prevent the influx of Ca2+ ions into the presynaptic cell that prevents the release of neurotransmitters into the synapse.
User Brian Glick
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