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4 marksRespiration

CSEC Biology · May/June 2019 · Paper 2 · Question 3(a)

Figure 4 shows a diagram of the human respiratory system.

Label, on the diagram, the FOUR structures that are directly involved in breathing.

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Other parts of this question

  1. 3(b)State how any THREE of the structures labelled in (a) function in breathing during inhalation.[4 marks]
  2. 3(c)Explain how any TWO features of the human lung make it an efficient respiratory surface.[4 marks]
  3. 3(d)Breathing rate can be affected by several factors. Explain how exercise and smoking may affect a person's breathing rate.[4 marks]

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