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| Cells of the sinoatrial node that set the pace of cardiac contraction. |
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| A small mass of specialized cardiac muscle fibers located in the posterior wall of the right atrium of the heart that acts as a pacemaker by generating at regular intervals the electric impulses of the heartbeat. |
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| Atrioventricular (AV) Node |
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| A small mass of specialized cardiac muscle fibers, located in the wall of the right atrium of the heart, that receives heartbeat impulses from the sinoatrial node and directs them to the walls of the ventricles. |
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| A bundle of modified heart muscle that transmits the cardiac impulse from the atrioventricular node to the ventricles causing them to contract |
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| A continuation of the atrioventricular bundle, which extends from the upper part of the intraventricular septum that transmits impulses to the right ventricle. |
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| A continuation of the atrioventricular bundle, which extends from the upper part of the intraventricular septum that transmits impulses to the left ventricle. |
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| Any of the specialized cardiac muscle fibers, part of the impulse-conducting network of the heart, that rapidly transmit impulses from the atrioventricular node to the ventricles. |
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| Supplies the left side of the heart with oxygenated blood from the pulmonary circuit. |
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| Anterior Interventricular Artery |
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| Supplies the left side of the heart with deoxygenated blood from the systemic circuit. |
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| Posterior Interventricular Artery |
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| Medial Umbilical Ligaments |
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