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2 marksThe Circulatory System of Mammals

CAPE Biology Unit 2 · 2004 · Paper 2 · Question 6(a)(i)

Physiology of red blood cells, gas transport, and haemoglobin dissociation under changing conditions.

Describe the structure of a red blood cell.

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  1. 6(a)(ii)Explain how red blood cells have the ability to carry large amounts of oxygen.[4 marks]
  2. 6(a)(iii)Describe how old erythrocytes are removed from the blood and disposed of in the body.[2 marks]
  3. 6(a)(iv)Explain why haemoglobin is NOT lost from the blood into the urine.[2 marks]
  4. 6(b)(i)During a space mission, a fault in the air filters caused an increase in carbon dioxide in the air. Discuss how this affects the oxygenation of the blood and…[8 marks]
  5. 6(b)(ii)On earth, at sea level, an oxygen partial pressure of 5 kPa results in a 50% saturation of haemoglobin by oxygen, and a partial pressure of 10 kPa results in a…[2 marks]

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