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Transcript 
THE HEART
TWO PUMPS BEAT AS ONE…
* Ventricles relaxed; AV and
semilunar valves closed; AV
valves open, ventricular filling occurs
P wave of ECG; atrial contraction forces remaining
blood into ventricles
* AV valves forced shut; QRS complex;
semilunar valves closed
* Ventricles contract; semilunar valves
blood forced out of ventricles
open;
*Ventricles relax; blood in aorta and pulmonary trunk flow
backward; semilunar valves close
Auscultation of thorax:
2 major sounds
1. Lub = blood turbulence of AV valves closing (R/S)
2. Dup = semilunar valves closing (after T)
http://www.ed4nurses.com/heartsnd.htm
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