BSCI201_Shannon Notes 3 - College of Computer, Mathematical...

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College of Computer, Mathematical and Natural SciencesBSCI201Human Anatomy and Physiology IOpoku-EduseiNotes 3Action potential electrical activity at the axolemma of an axonAll-or-none phenomenonGenerated when the membrane potential reaches the threshold potentialThe amplitude of an action potential is the same for all stimuli that generate action potentialGenerated/transmitted by only axonsPhases of action potential1)Depolarization phase due to the SODIUM INFLUX Na+ goes down its concentration gradient by moving into the axon since Na+ is a cation, the RMP becomes less and less negative the RMP is destroyed and as the potential gets to a critical potential called the THRESHOLD potential (-55 mV) explosive entry of Na+ that drives the potential to zero (+30 mV)a.The increase in the potential b/w the threshold potential and +30 mV UPSTROKE or the spikeb.The spike for action potential is the same for a weaker stimulus as a stronger stimulus

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Term
Fall
Professor
Opoku
Tags
Physiology, Human Anatomy, K channels, saltatory conduction

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