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2 marksThe Circulatory and Lymphatic Systems

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

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 why his heart rate rises during sprinting.

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