Pathway of blood through circulatory system

step 14

. Now that the blood has lost oxygen, the superior and inferior venae cavae returns the oxygen-poor blood back to the Right Atrium

step 3

As the RIGHT VENTRICLE starts to fill, the RIGHT ATRIUM contracts to push its contents into the RIGHT VENTRICLE

step 12

Once the Aortic Semilunar Valve opens, blood rushes to through the Aorta.

Step 6

Once the Pulmonary Semilunar Valve opens, blood rushes to through the Pulmonary Trunk that splits into the Pulmonary Arteries

step 13

The Aorta delivers the blood to the rest of the body to deliver oxygen

step 11

The Left Ventricle contracts and builds up pressure against the Aortic Semilunar Valve

step 7

The Pulmonary Arteries deliver the blood to the lungs where the blood picks up oxygen and drops of CO2. Now that the blood is oxygenated, it is delivered back to the heart through the Pulmonary Veins

step 8

The Pulmonary Veins deliver the oxygen-rich blood to the Left Atrium. As the blood enters the Left Atrium, it forces the Bicuspid AV Valve open

step 5

The Right Ventricle contracts and builds up pressure against the Pulmonary Semilunar Valve

step 10

Upon the emptying of the Left Atrium, the Bicuspid AV Valve closes

step 4

Upon the emptying of the Right Atrium, the Tricuspid AV Valve closes

step 9

While the blood is flowing from the Left Atrium into the Left Ventricle, the Left Atrium contracts to empty its contents into the Left Ventricle

Step 2

once blood enters the RIGHT ATRIUM and hits the Tricuspid AV valve, the valve opens to that blood can then enter the RIGHT VENTRICLE

Step 1

oxygen-poor blood is returned to the RIGHT ATRIUM through the vessels: Superior and Inferior venae cavae.