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13 Cards in this Set
- Front
- Back
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pacemaker cells
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cells that start the sequence of depolarization and repolarization
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inherent rythmicity/ automaticity
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property of cardiac tissue that enables it to depolarize and repolarize on its own
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Sinoatrial node (SA node)
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this creates and electrical signal that then spreads to the ventricular muscle via particular conducting pathways
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main functions of the heart
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to pump blood through two circuits; pulmonary and systemic circuits
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pulmonary circuits
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through the lungs to oxygenate the blood and remove carbon dioxide
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systemic circuit
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this circuit delivers oxygen and nutrients to tissues
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3 types of cells needed to beat
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1. rhythm generators
2. conductors 3. contractile cells |
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rhythm generators
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produce electrical signal
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conductors
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spread the pacemakers signal
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contractile (myocardium)
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mechanically pump blood
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SA node travels to the AV node
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on the internodal fibers
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When the SA node depolarizes...
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the electrical stimulus spreads through atrial muscle causing the muscle to contract
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SA node depolarization is followed by what?
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Atrial contraction
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