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2 marksExcretion and Homeostasis

CSEC Human and Social Biology · January 2014 · Paper 2 · Question 3(c)(i)

Figure 7 represents the internal mechanism of a kidney dialysis machine.

Based on the diagram in Figure 7, explain why a partially permeable membrane is needed in renal dialysis.

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Other parts of this question

  1. 3(a)(i)Name the parts labelled A and B in Figure 6.[2 marks]
  2. 3(a)(ii)State ONE function of EACH of the parts labelled A and B.[2 marks]
  3. 3(b)Name ONE excretory organ other than the kidney, and identify the substance it excretes.[2 marks]
  4. 3(c)(ii)Explain why the dialysis fluid must have approximately the same glucose concentration as the patient's blood.[2 marks]
  5. 3(c)(iii)Explain how the hypothalamus would control the water content of the blood when blood solute concentration is high, assuming normal kidney function.[5 marks]

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