BIOL4260 Study Guide - Midterm Guide: Heart Valve, Artificial Cardiac Pacemaker, Stethoscope

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3 May 2017
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In cardiac muscle, either all fibers in the heart contract as a unit or the heart does not contract at all: length of absolute refractory period in skeletal muscle contractions lasts 15-100ms with brief refractory period 1-2ms. In cardiac muscle the refractory period lasts over 200ms nearly as long as the contraction. 9. name the components of the conduction system of the heart, and trace the conduction pathway. The conduction starts at the pacemaker region called the sinoatrial node (sa node) which is just under where the superior vena cava enters the right atrium. From here the conduction passes to the atrioventricular node (av node) which is just to the right of the septum. From here the stimulation is passed through the atrioventricular (av) bundle (bundle of his) which carries the conduction to the septum where two bundle branches pick it up. These branches carry the conduction to the base of the septum where they separate into the.

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