What this practice covers
These questions are drawn from past CIE 9700 Biology papers and filtered to the heart. 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 heart, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying the left ventricle is thicker "because it pumps more blood". Both ventricles pump the same volume; the left generates more pressure.
- Saying valves open and close by muscle action. They are opened and closed by pressure differences.
- Saying the tendinous cords open the valves. They prevent them inverting.
- Saying the SAN sends a nerve impulse. It is cardiac muscle, and the wave is electrical excitation spreading through muscle.
- Forgetting why the AVN delays. Without it, the atria and ventricles would contract together and the ventricles would fill poorly.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: The heart revision notes.