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B8 Q1- Paper 2 Specimen (set 1) - Q1

1) Figure 1 shows a diagram of the heart.
Picture
(a) (i) Vessel X takes [1 mark]
Picture
(ii) Give one reason why the wall of the left ventricle is thicker than the right. [1 mark]

Valves in the human heart may become damaged and no longer function.
(iii) Describe what would happen to the flow of blood in the left side of the heart if the bicuspid valve did not function effectively. [2 marks]

​Figure 2 shows a photomicrograph of a blood vessel.
Picture
(b) Explain how the structure of this blood vessel is related to its function. [2 marks]

​Figure 3 shows a diagram of the circulatory system of a fish.
Picture
(c) Compare the differences between the structure of the circulatory system of a fish and the human circulatory system. [4 marks]

(Total for Question 1 = 10 marks)
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