Isovolumetric contraction of the ventricles follows which electrocardiographic event?
a. P wave c. S wave
b. R wave d. T wave
ANS: B
Ventricular systole begins with a period of isovolumetric contraction, which follows the peak of the R wave. Atrial systole follows the P wave. The S wave is followed by ventricular ejection. Isometric relaxation of the ventricles follows the T wave.
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