O LevelBiologyCambridge (CIE)Exam Questions11. Transport in Humans11.1 Circulatory System

Circulatory System (Cambridge (CIE) O Level Biology): Exam Questions

Exam code: 5090

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11.1 Circulatory System

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Fig. 4.1 shows a blue whale, a marine mammal that has a heart weighing up to 600 kg.

A photograph of a blue whale breaching the ocean surface.

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Fig. 4.1

Blue whales have a double circulatory system.

Explain the advantages of a double circulatory system over a single circulatory system.

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