In the sequence of events in neurotransmission, which event occurs just after the action potential arrives at the presynaptic terminal?Group of answer choicesPackaging of the neurotransmitterDelivery of the neurotransmitter to the presynaptic terminalFusion of the synaptic vesicles with the presynaptic membraneInflux of Ca2+ into the presynaptic terminalRelease of the neurotransmitter
Question
In the sequence of events in neurotransmission, which event occurs just after the action potential arrives at the presynaptic terminal?Group of answer choicesPackaging of the neurotransmitterDelivery of the neurotransmitter to the presynaptic terminalFusion of the synaptic vesicles with the presynaptic membraneInflux of Ca2+ into the presynaptic terminalRelease of the neurotransmitter
Solution
The event that occurs just after the action potential arrives at the presynaptic terminal is the influx of Ca2+ into the presynaptic terminal. Here's a step-by-step breakdown of the process:
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The action potential, or nerve impulse, travels down the neuron until it reaches the presynaptic terminal.
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Once the action potential arrives at the presynaptic terminal, it triggers the opening of voltage-gated calcium channels.
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This allows Ca2+ ions to flood into the presynaptic terminal.
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The influx of Ca2+ into the presynaptic terminal then triggers the next step in neurotransmission, which is the fusion of the synaptic vesicles with the presynaptic membrane.
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This fusion allows the neurotransmitter contained within the vesicles to be released into the synaptic cleft.
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The neurotransmitter then binds to receptors on the postsynaptic neuron, transmitting the signal across the synapse.
Similar Questions
What is the correct order for the events of neurotransmitter release from the synaptic terminal? 1) Extracellular Ca2+ enters terminal and binds to sensor protein in the cytoplasm2) Exocytosis of neurotransmitter into synaptic cleft3) Action potential reaches axon terminal4) Ca2+-protein complex stimulates fusion of the docked synaptic vesicle with the plasma membrane5) Voltage-gated Ca2+ channels open
Action potentials arriving at a presynaptic terminal causeMultiple Choicerelease of neurotransmitter.calcium ion channels to close.calcium ion channels to open.breakdown of acetylcholine.
Place the following events in excitatory synaptic transmission in order: 1 - A postsynaptic potential is produced. 2 - Voltage-gated calcium channels open and calcium enters the cell. 3 - ACh is released and diffuses across the axon terminal. 4 - A nerve signal arrives at an axon terminal. 5 - Ligand-gated sodium channels open and sodium enters the cell.
Which statement describes a possible outcome for a neurotransmitter after release into the synaptic cleft?Group of answer choicesActivation of G-protein-coupled receptor on postsynaptic cellModulation by an enzyme, increasing its efficiencyReuptake into postsynaptic terminal via transporter proteinsActivation of voltage-gated ion channel on presynaptic cellUptake into postsynaptic cell via endocytosis
A postsynaptic neuron responds to neurotransmitters released by a presynaptic neuron by creating
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