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.

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.