Blood Flow in the Heart Steps

1.

Deoxygenated blood enters the heart through the superior vena cava and the inferior vena cava.

5.

Deoxygenated blood enters the lungs, releases excess carbon dioxide and picks up oxygen to become oxygenated blood.

2.

Deoxygenated blood fills the right atrium.

7.

Oxygenated blood enters the heart and fills the left atrium.

6.

Oxygenated blood travels back to the heart through the pulmonary veins.

8.

Both atria contract and oxygenated blood travels down to fill the left ventricle.

3.

Both atria walls contract and the deoxygenated blood goes down to fill the right ventricle.

4.

Both ventricles contract and deoxygenated blood leaves the right ventricle through the pulmonary arteries.

9.

Both ventricles contract and oxygenated blood leaves the heart through the aorta.