There are two types of circulation.

1. Pulmonary circulation. The pulmonary circulation is when the heart pumps deoxygenated blood that contains CO2 from the right ventricle through the pulmonary artery to the lungs. Oxygenated blood returns to the left atrium by the pulmonary vein.

2. Systemic (peripheral) circulation. In systemic circulation, the heart pumps blood from the left ventricle to the aorta into the general circulation. Blood is carried by the arteries to the arterioles down to the capillary beds where nutrients in the blood are exchanged with waste products at the cellular level. Blood then returns through the venules to the veins back to the heart.

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