HTHSCI 1H06 Lecture Notes - Lecture 3: Norepinephrine, Gap Junction, Axon Terminal
29 Apr 2016
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Document Summary
Nerve condition - the transmission of nerve impulses across synapse the movement of nerve impulses down neurons. this is sometimes called the propagation of nervous impulses. In excitable tissues like axons and muscle bres, a wave of positive potential moves away from the point where a stimulus is initiated. In an axon, this wave is initiated in the axon hillock, a small area in a cell where the axon meets the soma. 3. stimulus triggers an action potential which depolarizes the local membrane the inside of the axon membrane becomes brie y positive. This increase in voltage triggers the next area of membrane to become positive because of opening of voltage sensitive na+ channels in the membrane. The area behind the depolarized membrane is in its refractory period so reverse conduction will not occur. Propagation and termination of the wave of depolarization along an excitable.
