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4 marksExcretion and Homeostasis

CSEC Human and Social Biology · January 2012 · Paper 2 · Question 4(b)(ii)

Renal tubule structure and urine formation.

Referring to Figure 4, explain the functioning of the Bowman's capsule, proximal convoluted tubule, loop of Henlé, and distal convoluted tubule when a person consumes excess water.

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Other parts of this question

  1. 4(a)(i)Define what is meant by 'homeostasis'.[2 marks]
  2. 4(a)(ii)Define 'negative feedback mechanism' and provide ONE physiological example.[3 marks]
  3. 4(b)(i)Define the term 'excretion'.[1 mark]
  4. 4(b)(iii)Describe how the colour of urine changes when consuming large amounts of water compared to drinking very little water.[1 mark]
  5. 4(c)Trace the pathway taken by carbon dioxide from its cellular site of production to the alveoli (air sacs) in the lungs.[4 marks]

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