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| proteins that are non-specific, leaky ion channels; allows sodium to diffuse btwn cells during depolarization; propagation of signal |
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| pumps blood to ventricles |
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| pumps blood to lungs (right) & body (left) |
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| normal flow of blood: to lungs... |
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| normal flow of blood: back to heart... |
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| bundle of His; pathway electric signal follows as it leave the AV node |
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| coordinate contraction of ventricles |
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| when action potential moves through two atria causing contraction |
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| action potential depolarizes the vells of the AV node |
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| ventricles depolarize and begin to contract |
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| ventricles repolarize and relax (in diastole) |
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| conduction system responsible for atrial systole... |
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| sympathetic system; norephinephrine |
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| parasympathetic; acetylcholine |
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| inform brain of changes in physical activity; increase heart rate before metabolic demand |
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| sense pressure in vessels, too high= lower heart rate, too low= increase heart rate |
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| sensitive to blood pH; too much CO2= increase heart rate to remove waste |
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