Bio redo

Bio redo - Action potential relies on the sodium-potassium...

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Action potential relies on the sodium-potassium pump and other membrane transport proteins. The Na/K pump is necessary because as the action potential propagates, the activation and inactivation gates open and close to prevent or allow for the flow of ions. The first opening of the NA+ ion channel involves an opening of both the activation and inactivation gates while the K+ voltage gated ion channel is still closed off. These membrane proteins open are close responding to stimuli. When the action potential nears the end of the axon and the terminal branches, vesicles containing neurotransmitters release across the synapse. This happens once CA++ enters the presynaptic cell through protein channels. The neurotransmitters bind to chemical or ligand receptor proteins in the postsynaptic cell. The neurotransmitters that do not make it to the postsynaptic are picked up by receptor-mediated endocytosis in the presynaptic cell. Most of the membrane transport at the end of the propagation is either exocytosis of neurotransmitters or facilitated diffusion through membrane channels. The action
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Bio redo - Action potential relies on the sodium-potassium...

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