[eSVT] Action potential and synaptic transmission

116,844 views

e-SVT M POURCHER

Published on Apr 1, 2020
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This video presents the nervous message that circulates within a neuron and which allows the control of muscle contraction via the neuromuscular synapse. First, an electrical nerve message, the action potential, is transmitted within the axon, unidirectionally and with saltatory conduction (80 m/s). Secondly, the message is transmitted to another cell, at the synapse, thanks to neurotransmitters and in particular acetylcholine which controls the contraction of muscle cells. 00:00​ The neuron and its structure (cell body, axon, dendrite, synapse) 02:15​ The membrane potential and the ddp 03:45​ The action potential (AP) 04:55​ The propagation of the AP (and myelin sheath) 07:26​ The coding of the message (in AP frequency) 09:21 Synapse and neurotransmitter (acetylcholine) 10:30​ Post-synaptic receptors and muscle contraction 11:14​ The action of curare on receptors 12:50​ The coding of the chemical message (in neurotransmitter concentration) Recommended level: Terminale S/SPE SVT Source: http://m.pourcher.free.fr

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