When the action potential reaches the axon terminal, ______ channels open and this ion induces ______. calcium; exocytosis chloride; hyperpolarization autoreceptor; inhibitory feedback on the neuron sodium; voltage-gated sodium channels to open
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Step 1: The question asks what channels open at the axon terminal when an action potential arrives and what the resulting ion influx induces. Show more…
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When voltage-gated calcium ion channels open at the synaptic terminal: a. calcium ions exit the cell, which repolarizes the membrane and resets the resting membrane potential. b. calcium ions rush into the neuron, depolarizing the membrane and triggering an action potential. c. calcium ions rush into the presynaptic neuron, which causes synaptic vesicles to release neurotransmitter into the synaptic cleft. d. voltage-gated sodium channels on the postsynaptic neuron open, which triggers an action potential if threshold is reached
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Look at the flow chart of an INHIBITORY synapse provided in the case-study PDF. Indicate which words would fill in the blank in the statements: 1- Voltage-gated channels open and ________ enter the pre-synaptic axon terminal. 2- _________ enter through the open channels and hyperpolarizes the postsynaptic cell. calcium; sodium potassium; calcium neurotransmitter; chloride sodium; chloride calcium; chloride
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Which of the following occurs first? Voltage-gated calcium channels are opened. Extracellular calcium enters the axon terminal. Synaptic vesicles exit by exocytosis. An action potential arrives at the axon terminal.
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