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2 marksThe Circulatory and Lymphatic Systems

CSEC Human and Social Biology · May/June 2009 · Paper 2 · Question 14(c)(iii)

Cardiac cycle, pulse, and regulation.

Suggest TWO reasons why an individual's pulse rate may increase after lunch (e.g. from 72 to 82).

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Other parts of this question

  1. 14(a)Identify the parts labelled A, B, C, D, and E in Figure 5 showing the heart and major blood vessels.[5 marks]
  2. 14(b)Explain how the heart functions as a double pump.[4 marks]
  3. 14(c)(i)State the function of the pacemaker in the heart.[1 mark]
  4. 14(c)(ii)State the number of heart beats in one minute for an individual with a pulse rate of 72.[1 mark]
  5. 14(d)(i)Suggest ONE possible cause of atherosclerosis as illustrated in Figure 6.[1 mark]
  6. 14(d)(ii)State the effect that narrowed arteries with atherosclerosis have on blood pressure.[1 mark]
  7. 14(d)(iii)Identify ONE difference in structure between an artery and a vein other than the thickness of the muscular wall.[1 mark]
  8. 14(e)Explain how vasodilation and vasoconstriction of skin blood vessels regulate body temperature.[4 marks]

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