Biology 2601A/B Chapter Notes - Chapter 12, 13, 15: Axon Hillock, Electrical Synapse, Resting Potential
26 Oct 2018
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Neural control - chap 12, 13 and 15. Neurons - generate/transmit electrochemical signals within cells - action potential (movement of ions) Between cells - chemical signaling at synapse - not between all cells --> communication of information between cells. If [ions] differs across membrane, voltage will differ between two sides (outside and inside) this difference is called a resting membrane potential (in resting cells) Whole cell potential depends on: ion concentration gradient across membrane and permeability differences of those ions some ions get through more easily than others: na+ is less permeable than k+ Action potential propagation: current from initial action potential depolarizes adjacent axon area to threshold, creates more aps, but slow, continuous flow of aps. Saltatory (jumping) conduction lots of voltage-gated na and k channels: action potentials go from node to node. Myelination insulates axons and restricts ion channels to nodes where action potentials are generated.
