This is the aspect that deals with the transport of blood needing oxygen from the lungs.

The blood is brought back from the body into the heart and shipped to the lungs.

The result is called oxygenated blood. It then goes back to the heart and is shipped out
to the rest of the body.

Step 1 – Oxygen depleted blood (filled with Carbon Dixoide) returns to the heart into
the Right Atrium then into Right Ventricle

Step 2 – Oxygen depleted blood leaves heart by the Right and Left Pulmonary Arteries and enters lungs

Step 3 – Oxygen depleted blood releases carbon dioxide

Step 4 - Oxygen enters blood stream via the lungs into the blood

Step 5 – Oxygenated blood returns to the heart via Pulmonary veins

Step 6 – Oxygenated blood enters Left Atrium then into Left Ventricle

Step 7 – Oxygenated blood is pumped to the body