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Presynaptic cell

presynaptic cell

(Science: physiology) In a chemical synapse, the cell that releases neurotransmitter that will stimulate the postsynaptic cell.

(Science: neurology) In an electrically synapsed system, the cell that has the first action potential, but since synapses are rectifying, one of the two cells involved is always presynaptic.

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Re: human physiology qu please help

... to fill in SOME of the details: When there is an action potential in a presynaptic neuron, it results in Neurotransmitter release from the axon ... example Acetylcholine) binds to receptors of the postsynaptic nerve cell. This then causes Sodium channels to open. Because Sodium is highly ...

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by LeslieSamuel
Thu Dec 24, 2009 2:38 am
Forum: Physiology
Topic: human physiology qu please help
Replies: 3
Views: 5754

human physiology qu please help

can anyone help me answer this qu : explain how an action potential in a presynaptic nerve cell may initiate graded potentials in dentrites of post-synaptic nerve cells

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by grainne89
Tue Dec 15, 2009 11:44 am
Forum: Physiology
Topic: human physiology qu please help
Replies: 3
Views: 5754

Glial cells...Neurons....and the SYNAPSE

:) Well, the neuron seems to have a huge independent glial cell system to help support it . By this I mean that we have glial cells that ... communications such as action potential(s) to reach the axon terminals/presynaptic and then cross the synaptic cleft to the postsynaptic receptors. ...

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by segarama
Mon Oct 31, 2005 6:36 pm
Forum: Cell Biology
Topic: Glial cells...Neurons....and the SYNAPSE
Replies: 8
Views: 6238

Nervous system

... which is the second event to occur in the depolarization of a nerve cell? A) Sodium channels open and rushes in. B) Sodium channels open and ... to A) prevent the postsynaptic membrane from depolarizing. B) cause the presynaptic membrane to depolarize only once. C) produce uncontrollable spasms. ...

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by Mstar888
Sun May 29, 2005 4:08 pm
Forum: Human Biology
Topic: Nervous system
Replies: 4
Views: 5552

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