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2 marksThe Circulatory and Lymphatic Systems

CSEC Human and Social Biology · January 2010 · Paper 2 · Question 4(b)

Explain why humans need a circulatory system to transport oxygen, while single-celled organisms like amoeba do not.

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Other parts of this question

  1. 4(a)Name the blood vessels labelled A, B, and C in Figure 3.[3 marks]
  2. 4(c)Explain how an iron deficiency affects the transport of oxygen by red blood cells.[4 marks]
  3. 4(d)Suggest ONE sign or symptom which may result from a deficiency of iron.[1 mark]

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