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Cardiac Micro and Physio (ECG (QT interval (Time for one cycle of…
Cardiac Micro and Physio
Cells
Conducting
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Depolarization (-40mV). At threshold, Ca channels open and Ca floods cell
Pacemaker potential (-60mV). Spontaneous depolarizations due to opening of leaky Na channels. Line is NEVER flat.
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Blood Flow
Pulmonary Circuit
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Valves: Tricuspid, Pulmonary semilunar
Systemic Circuit
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Valves: Mitral, Aortic semilunar
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Cardiac Cycle
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Ventricular diastole (430ms). Early: semilunar valves close. Late: ventricles refill passively. Longest phase
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