What characteristic of the heart ensures metabolic efficiency by completely separating oxygenated and deoxygenated blood?

Answer

It is a four-chambered heart

Similar to mammals, birds possess a four-chambered heart which completely separates oxygenated blood from deoxygenated blood, ensuring only the most oxygen-rich blood reaches the active tissues.

What characteristic of the heart ensures metabolic efficiency by completely separating oxygenated and deoxygenated blood?

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