PSYC314 Lecture Notes - Lecture 4: Axon Hillock, Resting Potential, Action Potential

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Synapse is the point of initiation of the action potential. Action potential generates release of chemicals that cause the channels to open. Na+ enters neuron and causes resting membrane potential to become less negative. Has a regeneration mechanism: schwann cells (node of ranvier in between insulation) Graded potentials reach the axon hillock which has a high density of voltage gated. Opens to a change in voltage instead of an electron. Has a voltage sensor which detects if one side is more negative, flips, and allows gates to open channels for a split second. Potassium goes out: resting state 2. Action reaches the end of an axon (synapse) and causes the release of neurotransmitter. 3 concepts in a cycle: neurotransmitter channel - graded potential. Channe l allows sodium: voltage gated channel - action potential. Channel opens and allows: na+/k+ pump - membrane potential (rest)

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