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2 marksSocial and Preventative Medicine

CAPE Biology Unit 2 · 2005 · Paper 2 · Question 3(b)(iv)

A 40-year-old subject participated in a 24-month endurance training programme, with adaptive muscle changes shown in Figure 5.

Explain why, when training ceases at 24 months, curves 's' and 'u' decline abruptly while curves 't' and 'v' decrease more slowly.

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Other parts of this question

  1. 3(a)Explain the procedures used and the calculations required to determine the VO2 max of an athlete.[4 marks]
  2. 3(b)(i)Calculate the percentage increase in VO2 max attained by the subject at the end of the 24-month period based on Figure 5.[1 mark]
  3. 3(b)(ii)Suggest why muscle fibres that increase in cross-sectional area in the first two months do not achieve further diameter increase over the remaining 22 months.[1 mark]
  4. 3(b)(iii)If muscle cells do not increase in size, suggest how muscles continue to cause an increase in VO2 max.[1 mark]
  5. 3(b)(v)On the graph in Figure 5, draw the letter X at the points showing the 50% VO2 max value at 18, 20, and 22 months.[1 mark]

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