What is the advantage of separate channels in mammals and birds for oxygenated and deoxygenated blood?

The advantage of having separate channels in birds and mammals for oxygenated and deoxygenated blood allows pumping of the blood hard and faster to the working muscles .The high pressure blood will be distributed in the body without damaging the delicate tissues of the lungs. The exchanges of gases also will be highly efficient and there won’t be mixing of the oxygenated and deoxygenated blood. The mammals are warm blooded animals and use lot of energy and therefore we need a great supply of oxygen for our activities.

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