Most of the muscle cells in the heart are contractile cells

Most of the muscle cells in the heart are contractile cells...

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Cardiovascular System Most of the muscle cells in the heart are contractile cells. The autorhythmic cells are located in these areas: * Sinoatrial (SA), or sinus, node - 60 - 100 per minute (usually 70 - 80 per minute) * Atrioventricular (AV) node - 40 - 60 per minute * Atrioventricular (AV) bundle (also sometimes called the bundle of His) * Right & left bundle branches * Purkinje fibers * Sinoatrial node- a patch of modified myocytes in the right atrium that is the pacemaker that initiates each heartbeat and determines the heart rate. * Atrioventricular node- located near the right AV valve and acts as an electrical gateway to the ventricles. * atrioventricular bundle (bundle of His)- a pathway by which signals leave the AV node * Right and left bundle branches- divisions of the AV bundle that enter the interventricular septum and descend toward the apex. * Purkinje fibers- nervelike processes that arise from the bundle of branches that distribute the electrical excitation to the myocytes of the ventricles
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Most of the muscle cells in the heart are contractile cells...

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