Biology · Animal Physiology
Which of the following correctly describes the difference in blood circulation between fish and mammals/birds?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Blood flows through the heart once in a complete cycle in fishes (single circulation) and twice in mammals/birds (double circulation).✓
- 2Blood flows through the heart twice in a complete cycle in fishes and once in other vertebrates.
- 3Blood flows through the heart in the exact same pathway in both fishes and mammals.
- 4Fishes lack a functional heart.
Correct answer
Blood flows through the heart once in a complete cycle in fishes (single circulation) and twice in mammals/birds (double circulation).
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