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2 marksTransport Systems

CSEC Biology · May/June 2014 · Paper 2 · Question 2(a)(ii)

Figure 4 shows an external view of the human heart.

Explain how the function of the heart may be affected by a blockage of the blood vessel shown at X.

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Other parts of this question

  1. 2(a)(i)Identify the structures labelled A, B and C in Figure 4. Write your answers on the lines provided in Figure 4.[3 marks]
  2. 2(b)(i)Which blood vessel, A or B, represents a vein?[1 mark]
  3. 2(b)(ii)Identify ONE structure visible in Figure 5 which helps a vein to carry out its function.[1 mark]
  4. 2(b)(iii)Explain how the structure identified in (b)(ii) allows the vein to fulfil its function.[2 marks]
  5. 2(b)(iv)Explain how such deposits may lead to hypertension.[2 marks]
  6. 2(c)Identify the vessels shown at Positions P and Q in Figure 6.[2 marks]
  7. 2(d)Explain why plants do NOT need an organ like a heart in their transport system, and outline ONE mechanism by which plants move fluids through their transport…[2 marks]

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