lab.4.06 - BIOL 204 Week 4 Lab Electrocardiography Human...

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BIOL 204 – Week 4 Lab Electrocardiography Human Arteries and Veins Blood Vessel Histology
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Objective 1 ECG An electrocardiogram is a graphical recording of the hearts electrical changes during a cardiac cycle (heart beat) - Electrical changes initiated and propagated through the myocardium by specialized cells of the heart’s intrinsic conduction system Structures of the Intrinsic Conduction Voltage changes seen System
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The  vo lta g e  c ha ng e s  a re  re c o rde d b y  leads  whic h c a n b e  pla c e d in  diffe re nt lo c a tio ns  o n the  b o dy We  will us e   limb leads , placed on the appendages to record ECGs in this lab Lead 1: RA -, LA + most sensitive to electrical activity spreading horizontally across the heart Lead 2 RA -, LL + most sensitive to electrical activity spreading vertically (from the base to the apex) Lead 3 LA - . LL + also records electrical activity spreading from the base to the apex, but from a different orientation
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lab.4.06 - BIOL 204 Week 4 Lab Electrocardiography Human...

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