O-LevelBiologyTransport in Humans5090/21 · May/June 2015 · Q210 Marks

Table 2.1 shows the volume of blood supplied to parts of the body at rest and during strenuous exercise. Table 2.1 volume of blood supplied in cm³/min part of body at rest during strenuous exercise brain 750 750 heart 250 750 skeletal muscle 1200 12500 skin 500 1900 kidneys 1100 digestive organs 1400 600 other 600 400 Total 5800 17500

(a)(i)Calculate the volume of blood that is supplied to the brain at rest as a percentage of the total supplied to the whole body. Show your working in the space below. %[2]
(a)(ii)Name the blood vessels that supply each kidney with blood.[1]
(a)(iii)Using the information in Table 2.1, calculate the volume of blood supplied to the kidneys during strenuous exercise. Write your answer in the space provided in Table 2.1.[1]
(b)Use the information in Table 2.1 to name two parts of the body that have an increased supply of blood during strenuous exercise. Explain the advantage to the body of increasing the supply of blood to each of the parts you name. name of part advantage name of part advantage[4]
(c)Using the information in Table 2.1, suggest why eating immediately before exercise is not recommended.[2]

Mark scheme

Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.

[2] (750/5800) *100 ;
[2] 12.9 / 13 (%);
[1] renal artery ;
[1] 600 ;
[max 4] heart ;
[max 4] skeletal muscle ;
[max 4] for above named parts ref. supply of more oxygen/glucose ;
[max 4] ref. increased (aerobic) respiration / prevent anaerobic respiration ;
[max 4] remove lactic acid (for skeletal muscle only);
[max 4] ref. contract harder/faster ;
[max 4] skin ;
[max 4] increased heat loss ;
[max 2] less blood to digestive organs ;
[max 2] less digestion ;
[max 2] less/slower absorption of products of digestion ; A ref. active transport in digestive system

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