Multiple choice

Avian heart is __________.

  1. two - chambered

  2. four - chambered

  3. three - chambered

  4. five - chambered
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All birds (aves) have a four-chambered heart with complete separation of oxygenated and deoxygenated blood. This is an adaptation supporting their high metabolic rate and endothermy (warm-bloodedness), enabling the sustained energy demands of flight. The four chambers are two atria and two ventricles.

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