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3 marksThe Kidney, Excretion and Osmoregulation

CAPE Biology Unit 2 · 2016 · Paper 2 · Question 2(b)(i)

Figure 3 shows a photomicrograph of a cross-section through the mammalian kidney medulla.

Identify the regions of the nephron labelled A, B, and C in Figure 3.

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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(a)(iii)Comment on the significance of this response for oxygen transport in the body.[2 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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