Fig. 4.1 is a diagram of the human heart. Fig. 4.1 Describe two ways the structure of an artery differs from the structure of a vein. 1 ............................................................................................................................................ ............................................................................................................................................... . 2 ............................................................................................................................................ ............................................................................................................................................... .

Biology

IGCSE&ALevel

CAIE

Exam No：0610_s24_qp_33 Year：2024 Question No：4(b)

Answer:

9.1.1 Describe the circulatory system as a system of blood vessels with a pump and valves to ensure one-way flow of blood

9.1.2 Describe the single circulation of a fish

9.1.3 Describe the double circulation of a mammal

9.1.4 Explain the advantages of a double circulation

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