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2 marksThe Respiratory System

CSEC Human and Social Biology · May/June 2011 · Paper 2 · Question 4(b)(i)

A middle-aged former athlete who smokes heavily attempts a 100 m sprint and stops midway due to severe pain in his legs and sides, struggling for breath.

Explain how transitions between aerobic and anaerobic respiration account for his inability to finish the sprint.

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Other parts of this question

  1. 4(a)(i)Identify the structures labelled A, B, and C in Figure 4.[3 marks]
  2. 4(a)(ii)Complete the statement detailing the movement of the ribcage and diaphragm during inhalation.[3 marks]
  3. 4(b)(ii)Explain why his heart rate rises during sprinting.[2 marks]
  4. 4(b)(iii)Explain the cause of the pain in his leg muscles.[2 marks]
  5. 4(b)(iv)Explain why he is forced to breathe through his mouth after stopping.[2 marks]
  6. 4(b)(v)State how smoking contributed to his failure to complete the sprint.[1 mark]

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