Atria facilitate circulation primarily by allowing uninterrupted venous flow to the heart, preventing the inertia of interrupted venous flow that would otherwise occur at each ventricular systole.
22.
Similar to the aortic valve, the pulmonary valve opens in ventricular systole, when the pressure in the right ventricle rises above the pressure in the pulmonary artery.
23.
By preventing the inertia of interrupted venous flow that would otherwise occur at each ventricular systole, atria allow approximately 75 % more cardiac output than would otherwise occur.
24.
The late filling of the left ventricle contributes about 20 % to the volume in the left ventricle prior to ventricular systole, and is known as the " atrial kick ".
25.
During ventricular systole, pressure rises in the left ventricle and when it is greater than the pressure in the aorta, the aortic valve opens, allowing blood to exit the left ventricle into the aorta.
26.
Cardiac output ( blood flow measured in volume per unit time ) is computed by multiplying the heart rate ( in beats per minute ) and the stroke volume ( the volume of blood ejected during ventricular systole ).
27.
In human physiology, the atria facilitate circulation primarily by allowing uninterrupted venous flow to the heart during venous flow to the heart that would occur during ventricular systole if the veins ended at the inlet valves of the heart.
28.
In the second phase of ventricular systole, the ventricular ejection phase, the contraction of the ventricular muscle has raised the pressure within the ventricle to the point that it is greater than the pressures in the pulmonary trunk and the aorta.
29.
Stroke volume will normally be in the range of 70 80 mL . Since ventricular systole began with an EDV of approximately 130 mL of blood, this means that there is still 50 60 mL of blood remaining in the ventricle following contraction.
30.
Stages 2 and 3 involve the " ventricular systole " i . e . the movement of blood from the ventricles to the pulmonary artery ( in the case of the right ventricle ) and the aorta ( in the case of the left ventricle ).
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