CAIE A Level Biology 9700 · Transport in mammals
A patient is diagnosed with a leaking left atrioventricular valve (mitral valve regurgitation). Describe the effect of this condition on the pressure changes in the left atrium and left ventricle during the cardiac cycle, and on the opening and closing of the heart valves.
6 marks, so the mark scheme is looking for about 6 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.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.