The Action of the heart

Arrange the following processes in the correct order to show the way the heart pumps blood
(The first step is correct)

1. Blood flows towards the heart in the vena cava and the pulmonary vein

• Semilunar valves prevent the blood flowing back into the Ventricles

• Atria contract and pump blood through the atrio ventricular valves

• Blood is collected by the left and right atria.

• Blood is then pumped out by the ventricles into the aorta and pulmonary artery

Step Two

Describe what is happening in each photo below. You must include:
atrio-ventricular valves, ventricles, atria, blood, contract / relax, open / close