A-LevelBiologyTransport in mammalsMay/June 2010Paper 1 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
The correct answer is D. This question tests the candidate's understanding of transport in mammals within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep