A-LevelBiologyTransport in mammals9700/12 · May/June 2010 · Q381 Mark
Aortic stenosis is a heart valve disorder in which the aortic semi-lunar valve opening is narrow. Which effect could aortic stenosis have on the heart structure and function?
AThe tendons of the heart valves are weakened by blood being forced back through the bicuspid/left atrio-ventricular valve into the left atrium.
BThe cardiac muscle of the left ventricle wall is thinned by blood leaking out of the left ventricle during ventricular diastole.
CThere is less cardiac muscle in the left ventricle and reduced diastolic blood pressure, caused by the smaller blood volume entering the left atrium.
DThe wall of the left ventricle thickens, leading to an enlarged heart and inability to relax and fill completely during diastole.
✓ Correct answer
D: The wall of the left ventricle thickens, leading to an enlarged heart and inability to relax and fill completely during diastole.
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