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2 marksThe Circulatory System of Mammals

CAPE Biology Unit 2 · 2016 · Paper 2 · Question 2(a)(iii)

Table 1 provides data on the percentage saturation of adult human haemoglobin with oxygen at different partial pressures of oxygen.

Comment on the significance of this response for oxygen transport in the body.

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Other parts of this question

  1. 2(a)(i)On the grid provided on page 9, plot a line graph of saturation of haemoglobin at various partial pressures of oxygen.[4 marks]
  2. 2(a)(ii)With reference to the shape of the plotted graph, describe the observed changes in oxygen uptake by haemoglobin as oxygen concentration increases.[2 marks]
  3. 2(b)(i)Identify the regions of the nephron labelled A, B, and C in Figure 3.[3 marks]
  4. 2(b)(ii)Outline the process of urea formation and suggest a reason why mammals produce nitrogenous waste in the form of urea.[4 marks]

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