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2 marksRespiration

CSEC Biology · January 2006 · Paper 2 · Question 2(b)(ii)

A graph shows the number of deaths due to heart disease among smokers and non-smokers.

Suggest TWO reasons why smoking may contribute to heart disease.

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Other parts of this question

  1. 2(a)(i)Name the parts of the heart labelled I and II in Figure 2.[2 marks]
  2. 2(a)(ii)Using FOUR arrows only, show on the diagram the direction of blood flow from the pulmonary artery to the aorta.[4 marks]
  3. 2(a)(iii)Name TWO structures shown in the diagram that ensure the blood flows in one direction only.[2 marks]
  4. 2(b)(i)Draw ONE conclusion based on the graph.[2 marks]
  5. 2(b)(iii)Identify TWO factors besides smoking that could cause the heart to malfunction.[2 marks]

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