Action potentials arriving at a presynaptic terminal cause
Question
Action potentials arriving at a presynaptic terminal cause
Solution
Action potentials arriving at a presynaptic terminal cause the opening of voltage-gated calcium channels. Here's a step-by-step breakdown:
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An action potential, or nerve impulse, travels down the axon of the neuron.
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When the action potential reaches the presynaptic terminal (the end of the neuron), it causes the voltage-gated calcium channels to open.
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The opening of these channels allows calcium ions to flow into the neuron.
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The influx of calcium ions triggers the release of neurotransmitters from vesicles within the neuron.
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These neurotransmitters are then released into the synaptic cleft (the gap between neurons) and bind to receptors on the postsynaptic neuron (the receiving neuron).
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This binding can either excite or inhibit the postsynaptic neuron, depending on the type of neurotransmitter and receptor, thus continuing the transmission of the nerve impulse.
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