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1. Deoxyhaemoglobin travels through the superior and inferior vena cava.

2. Through the right atrium, past the biscupid valve into the right venticle.

3. Enters the pulmonary artery to the lungs through the pulmonary semilunar valve.

4. Oxyhaemoglobin travels through the capillaries in the lungs.

5. Enters the left atrium through the pulmonary veins, to the left ventricle through the tricuspid valve.

6. It is pumped from the aorta, as it passes through the aortic semilunar valve- to the tissues in the body for oxygen exchange