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CAIE A Level Biology 9700 · Transport in mammals

Transport in mammals: explain question

Explain5 marksChallenge

During a 10 km race, the leg muscles of an athlete receive greatly increased blood flow to meet the demand for oxygen and remove carbon dioxide and heat.

(a) Explain how the structure of the blood vessels supplying the leg muscles (arteries, arterioles, capillaries, venules and veins) is adapted to meet the increased demand for oxygen and removal of waste during the run.

(b) Explain why there is an increase in tissue fluid formation in the leg muscles during the race, and describe how the properties of water contribute to the functions of tissue fluid.

0 words · 5 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.

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