CAIE A Level Biology 9700 · Transport in mammals
A patient is diagnosed with a leaking left atrioventricular (bicuspid) valve. This means that the valve does not close completely during ventricular systole.
Describe the effects of this condition on the pressure changes in the left atrium and left ventricle during one cardiac cycle, and on the opening and closing of the heart valves.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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