BIO SCI E182 Lecture Notes - Cardiac Output, Cardiac Muscle, Coronary Circulation
2 Mar 2014
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Document Summary
All cells of the sa node, av node, and intermodal pathways are authorhythmic, so another part can take over if the sa node cells are not function. Atria are connected to the ventricles by the av node. Established correlation between electrical pattern measured on skin and heart electrical activity. Non-invasive (attaches electrodes to outside of body to monitor electrical activity inside of body) Each red line represents a pair of electrodes. Ecg measurement represents sum of all electrical activity (indirect measurement and complicated to interpret) +depending on where you put the leads, you get a different pattern. +different from voltage measurements: measure of inside the cell vs. outside the cell. A lead consists of two electrodes, one positive and one negative. See graph of temperature vs. time in presentation. Heart is not centrally-located, and is tilted; if position and electrical activity was perfectly symmetrical, ecg would be flat!
