Cardiac Cycle

The pressure in the ventricles is low during

early in diastole.

About______% of the blood flows passively from the atria into ventricles and the remaining blood is pushed into the ventricles when the___________________.

70; ventricular pressure increases.

As blood flows out of the ventricles, ventricular pressure

Begins to drop

During ventricular systole, ventricular pressure increases and the____________valves open.

Pressure differences across the semilunar valves cause the pulmonary and aortic

During a cardiac cycle, the pressure within the heart chambers

Rises and falls, and these changes open and close valves.

During diastole, the A-V valves are

opened and ventricles fill up.

The semilunar valves close when

The ventricular Pressure is lower than the blood pressure in the aorta and pulmonary trunk, and the pressure is reversed.