CSEC Human and Social Biology · May/June 2009 · Paper 2 · Question 14(b)
Explain how the heart functions as a double pump.
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Practise this questionOther parts of this question
- 14(a)Identify the parts labelled A, B, C, D, and E in Figure 5 showing the heart and major blood vessels.[5 marks]
- 14(c)(i)State the function of the pacemaker in the heart.[1 mark]
- 14(c)(ii)State the number of heart beats in one minute for an individual with a pulse rate of 72.[1 mark]
- 14(c)(iii)Suggest TWO reasons why an individual's pulse rate may increase after lunch (e.g. from 72 to 82).[2 marks]
- 14(d)(i)Suggest ONE possible cause of atherosclerosis as illustrated in Figure 6.[1 mark]
- 14(d)(ii)State the effect that narrowed arteries with atherosclerosis have on blood pressure.[1 mark]
- 14(d)(iii)Identify ONE difference in structure between an artery and a vein other than the thickness of the muscular wall.[1 mark]
- 14(e)Explain how vasodilation and vasoconstriction of skin blood vessels regulate body temperature.[4 marks]
More practice: the rest of this paper · more The Circulatory and Lymphatic Systems questions · all CSEC Human and Social Biology past papers