Pressure rising in the ventricles but no blood being ejected is ...

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Pressure rising in the ventricles but no blood being ejected is the definition of:
 
  a. ventricular systole. c. isovolumetric relax-ation.
  b. ventricular diastole. d. isovolumetric con-traction.

Question 2

Isovolumetric contraction of the ventricles follows which electrocardiographi c event?
 
  a. P wave c. S wave
  b. R wave d. T wave

[Ptupou85]

Answer to Question 1

ANS: D
During isovolumetric contraction, the ventricular muscle fibers shorten, but the volume of blood in the ventricle remains constant because the mitral valve, tricuspid valve, aortic valve, and the pulmonary valve remain closed.

Answer to Question 2

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.