BSCI 201 Study Guide - Quiz Guide: Myelin, Neurolemma, Schwann Cell
6 Jan 2017
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Axonal terminal: end of axon; conducts signal. Neurilemma: plasma membrane around schwann cell part of axon. Nodes of ranvier: gaps in myelin sheath. Epineurium: wraps nerve or tract (tough: define: Cell body: biosynthetic center of the cell: creates and stores organelles, amitotic. Dendrites: receptive center: receive and convey signals to cell body. Axon: conducting region: carries signals away from cell body: define: Astrocytes: regulate brain function and chemical environment or brain. Ependymal cells: line ventricles, circulate cerebrospinal fluid. Depolarization phase: na ions enter cell & makes it less negative. Threshold is reached (~55 mv) and more na is pumped in. Repolarization phase: na channels close, k channels open & k leaves cell, allowing it to become negative again: define: Absolute refractory period: another action potential cannot be generated. Relative refractory period: if strong enough, an action potential can be generated: define structural classes of neurons: Multipolar: at least 3 processes (1 axon, 2+ dendrites)
