CSCD 3235 Chapter Notes - Chapter 3-4: Channelopathy, Repolarization, Saltatory Conduction
6 Apr 2017
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Human neuroscience study guide chapters 3 & 4. Cations: an ion that has a positive charge and characteristically moves towards negative ions. Resting potential: -70mv, inside of the neuron is negatively charged. At rest, there are relatively more sodium ions outside and more potassium ions inside. Neuron is polarized and not excited into ap. Saltatory conduction: the propagation of aps along the myelinated axons from one node of ranvier to the next node, increasing velocity of ap. Action potential: short lasting event in which the electrical membrane potential of a cell rapidly rises and falls, sending a consistent trajectory of electrical signals along the axon. Ion channel: pore-forming membrane proteins whose functions include establishing a resting membrane potential, shaping action potentials and other electrical signals by gating the flow of ions across the cell membrane. Ion gating: the control of the ion channel as to the amount of ions allowed in and out of the cell.
