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About what percentage of blood passes into the ventricles before the atrial walls contract?
When the pressure in the ventricles exceeds the pressure in the pulmonary trunk and aorta.
When do the pulmonary and arotic valves open?
The SA node (Sinoatrial node)
Under normal circumstances, what serves are the pacemaker of the heart?
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.
Atrial repolarization occurs at the same time as ventricular depolarization. The QRS complex hides atrial repolarization.
Why is atrial repolarization not observed in an ECG?
The mitral valve A.K.A. bicuspid valves
What prevents blood movement from the right ventricle to the right atrium?
What is the space called that contains serous fluid that reduces friction during heartbeats?
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