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About what percentage of blood passes into the ventricles before the atrial walls contract?
When do the pulmonary and arotic valves open?
When the pressure in the ventricles exceeds the pressure in the pulmonary trunk and aorta.
Under normal circumstances, what serves are the pacemaker of the heart?
The SA node (Sinoatrial node)
What are the fibers that carry cardiac impulses from the interventricular septum into the myocardium called?
What is a recording of electrical changes occuring in the myocardium during the cardic cycle called?
Between cardiac cycles, cardiac muscle fibers remain __?__ with no detectable electrical changes.
Why is atrial repolarization not observed in an ECG?
Atrial repolarization occurs at the same time as ventricular depolarization. The QRS complex hides atrial repolarization.
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