Double circulation occurs in mamamals due to the lungs.The blood passes through the heart in the circuit twice.Blood flows from the main circulation of the body to the heart, then to the lungs and back to the heart again before it is punmped into the main circulation .Veins carry deoxygenated blood from variousparts of the body to theheart. From the heart, the pulmonary arteries carry blood to the lungs. Thge oxygenated blood returns to the heart by the pulmonary veins. Generally, the circulation linking the lungs to the heart is known as the pulmonary circulation. When the oxygenated blood leaves the left side of the heart and is distributed by the arteries to the rest of the body, apart from the lungs. The veins carry the blood from all parts of the body back to the right side of the heart.This circulation is called the systemic circulation. There are many advantages the pulmonary circulation and the systemic circulation allows. Blood entering the lungs is at a low pressure and therefore, it ensures that the blood is well oxygenated before it is returned to the heart. The blood leaving the heart for systemic circulation is at a high pressure. This ensures that the oxygenated blood is well distributed to the parts of the body at a faster rate. Additionally, it helps to maintain a high rate of metalbolic in animals.
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