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What is a presynaptic neuron?

Updated: 4/28/2022
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12y ago

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a neuron from the axon terminal of which an electrical impulse is transmitted across a synaptic cleft to the cell body or one or more dendrites of a postsynaptic neuron by the release of a chemical neurotransmitter.

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Q: What is a presynaptic neuron?
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Related questions

What is an example of a presynaptic cell?

a neuron


What part of the neuron sends information to others?

Presynaptic neuron sends postsynaptic receives


The surface on a neuron that discharges synaptic vesicles is the?

Presynaptic membrane


What is The process by which the neurotransmitter substance leaves the presynaptic terminal button is called?

Leaves the presynaptic neuron, activates ion channel


What is the presynaptic neuron release neurotransmitters in response to an influx of?

Sodium ions


What portion of a neuron forms the presynaptic neuronal membrane?

Terminal Button


These lipid molecules may function as retrograde neurotransmitters and allow the postsynaptic neuron to decrease release of neurotransmitter from the presynaptic neuron?

endocannabinoids


How does an impulse travel from a presynaptic neuron to a postsynaptic neuron?

When the action potential reaches the button(axon terminal) of the presynaptic neuron the depolarization causes voltage gated calcium channels to open increasing intracellular calcium content. This causes synaptic vesicles to fuse to the membrane and release neurotransmitters that bind to the post synaptic neuron and create a chemical action potential.


When two or more presynaptic neurons synapse with a single postsynaptic neuron in the CNS what pathway is formed?

Divergent


How Neurotransmitter molecules are removed from a synapse by?

Being broken down by enzymes and being reabsorbed by the presynaptic neuron.


What is presynaptic inhibition?

Inhibition of a stimulatory neuron before it synapses, by inhibiting Ca2+ entry and blocking downstream processes, preventing neurotransmitter release, and therefore preventing the neuron generating and EPSP post-synaptically.


How do Presynaptic neurons release neurotransmitters?

They don't, the neurotransmitters stay on either side of the synapse. Neurotransmitters are released when the synaptic vesicles fuse with the presynaptic neuron's membrane, so as to release them into the synaptic cleft.