Why is it necessary to separate oxygenated and deoxygenated blood in mammals and bids? Medium Open in App Solution Verified by Toppr Mammals and birds have evolved to sustain a terrestrial life form and homeothermic ability that needs more energy as compared to other life forms.

The heart consists of four chambers: the two atria and the two ventricles. Blood returning to the heart enters the atria, and is then pumped into the ventricles. From the left ventricle, blood passes into the aorta and enters the systemic circulation. From the right, it enters the pulmonary circulation via the pulmonary arteries.

Policy How does blood flow through your body? Here’s how blood flows through your body: Veins bring blood to the right side of your heart. Pulmonary arteries carry the blood to your lungs, where it receives oxygen. Pulmonary veins move the blood oxygen-rich blood to the left side of your heart.

the pulmonary vein returns oxygenated blood from the lungs to the heart; Arteries carry oxygenated blood away from the heart (except for the pulmonary artery which carries deoxygenated blood away.