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2 marksTransport Systems

CSEC Biology · January 2008 · Paper 2 · Question 3(a)(iii)

Figure 3 shows a longitudinal section through the human heart.

Some babies are born with a small opening in the wall/septum between the two upper chambers of the heart. Suggest how this condition would affect the functioning of the heart when the atria contract.

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Other parts of this question

  1. 3(a)(i)Using FOUR arrows ONLY show the direction of flow of blood into and out of the human heart illustrated in Figure 3.[4 marks]
  2. 3(a)(ii)Name the blood vessels labelled P and Q respectively.[2 marks]
  3. 3(b)(i)Name TWO substances that the heart muscle cells will receive in this blood supply.[2 marks]
  4. 3(b)(ii)Identify ONE substance found in the blood supply that can cause the walls of the coronary artery to thicken.[1 mark]
  5. 3(b)(iii)How does the thickening of the coronary arterial wall affect the heart?[2 marks]
  6. 3(c)Identify TWO types of transport vessels in plants and for EACH identify ONE substance which it transports.[4 marks]

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