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2 marksRespiration

CSEC Biology · January 2010 · Paper 2 · Question 2(a)(ii)

Figure 3 shows a cross-section through an alveolus.

Identify the gases indicated by the arrows, A and B, in Figure 3.

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Other parts of this question

  1. 2(a)(i)Name the structures labelled P, Q, R and S in Figure 3.[4 marks]
  2. 2(b)(i)Name the process by which gases move in the directions shown by the arrows.[1 mark]
  3. 2(b)(ii)Identify ONE feature illustrated in the diagram which shows that the alveolus is suitable for gaseous exchange.[1 mark]
  4. 2(c)What is the role of breathing in the movement of the gases illustrated in Figure 3?[2 marks]
  5. 2(d)A person who is exercising vigorously breathes more deeply and rapidly than someone who is resting. Give TWO reasons why this is necessary.[2 marks]
  6. 2(e)Explain how cigarette smoking can reduce the efficiency of the lungs.[3 marks]

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