Question

Why do mammals and birds have four chambered heart??

Answer 1

The blood is pumped by a heart with three chambers, two atria and a single ventricle. (4) Mammals and birds have a heart with four chambers that completely separate the oxygenated and deoxygenated blood- it pumps oxygenated blood through the body and deoxygenated blood only to the lungs.

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Answer 2

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It allows us to send our "dirty" blood to the cleaners-the lungs-and our "clean" blood to the rest of the body without having to mix the two. That system is very efficient.