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6 Cards in this Set
- Front
- Back
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name the receptor found only in the heart responsible for increasing heart rate and contractility
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beta one adrenergic
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why can't the SA node establish a resting membrane potential
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leaky (slow) Na+ channels
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what is retrograde transmission
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refers to reverse depolarization via gap junctions
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what is the significance about phase 2 of the ventricular myocyte action potential
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calcium entry maintains depolarized state (prevents retrograde transmission) and enhances greater contractility
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cardiac output (Q) =
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heart rate X stroke volume
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how does the parasympathetic nervous system affect phase 4 of the SA node
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-decreases the leakiness of the slow leaky sodium channels
-it decreases the slope and therefore increases the time of the threshold |
