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The heart of crocodile is four-chambered but it can retain the mixed blood. This is due to:

1. the two ventricles together in humans.
2. the heart that contracts under stimulation from nervous system.
3. left auricle and left ventricle in higher vertebrates.
4. entire heart in lower vertebrates.

Correct answer: the two ventricles together in humans.

Solution

The correct choice points to the key idea that in humans the two ventricles are fully separated, preventing mixing of oxygenated and deoxygenated blood. Crocodiles have a four-chambered heart, but their circulation still allows some mixing because the separation is not functionally complete in the same way.

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