What this practice covers
These questions are drawn from past CIE 9700 Biology papers and filtered to the circulatory system. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on the circulatory system, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying arteries carry oxygenated blood. They carry blood away from the heart; the pulmonary artery is deoxygenated.
- Saying veins have valves "to keep the pressure high". Valves prevent backflow.
- Saying elastic tissue in an artery lets it stretch, and stopping there. The recoil is what maintains flow between heartbeats.
- Saying tissue fluid returns to the capillary because of hydrostatic pressure. It returns by osmosis, because plasma proteins remain behind.
- Saying blood flows slowly in capillaries because they are narrow. It is the large total cross-sectional area of all of them together.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: The circulatory system revision notes.