Question

What happens in the filling phase?

Answer 1

Cardiac cycle:

1. It is caused by a sequence of pressure shifts inside the heart.
2. These pressure variations cause blood to flow through various chambers of the heart and throughout the body.

There are four phases to the cardiac cycle:

1. Filling phase - During diastole and atrial systole, the ventricles fill.
2. Isovolumetric contraction - In preparation for pumping blood into the aorta/pulmonary trunk, the ventricles contract, raising pressure.
3. Outflow phase-The ventricles continue to contract, forcing blood into the aorta and the pulmonary trunk and this is also referred to as systole.
4. Isovolumetric relaxation- In preparation for the next filling phase, the ventricles relax.

Filling phase :

1. Diastole and atrial systole are the two phases in which blood is entered into the ventricles.
2. Both the atria and ventricles are relaxed during diastole.
3. Blood flows from the vena cava and pulmonary veins into the right and left atria before entering the ventricles directly.
4. The ventricles fill with blood at a decreasing pace until the pressure in the ventricles equals the pressure in the veins.
5. The atria constrict at the conclusion of diastole, squirting a little quantity of additional blood into the ventricles.
6. This elevates the pressure in the ventricles to that of the atria, causing the atrioventricular valves to close.