Why is deoxygenated blood kept separate from oxygenated blood in the hearts of some animals like human beings?

Question

Why is deoxygenated blood kept separate from oxygenated blood in the hearts of some animals like human beings? — Exam MCQ

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B. To help in keeping the body temperature constant — Efficient oxygen delivery supports the high metabolic rate needed to maintain a constant body temperature.

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A. To help in the growth and functioning of muscles

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C. To maximise oxygenation of blood in the lungs

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D. To provide oxygen to a large-bodied animal

Why is deoxygenated blood kept separate from oxygenated blood in the hearts of some animals like human beings?

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