A-LevelBiologyTransport in mammalsOct/Nov 2014Paper 1 Q311 Mark
One type of congenital heart defect is called atrial septal defect (ASD) where the left and right atria are not completely separated. ASD usually results in blood moving from the left atrium into the right atrium. This will cause increased blood pressure in the right atrium and decreased blood pressure in the left atrium. Which row describes the other effects of ASD on blood pressure and oxygenation?
Ablood pressure in pulmonary artery: decreased, blood pressure in aorta: increased, % oxygenation of blood in pulmonary artery: decreased
Bblood pressure in pulmonary artery: decreased, blood pressure in aorta: increased, % oxygenation of blood in pulmonary artery: increased
Cblood pressure in pulmonary artery: increased, blood pressure in aorta: decreased, % oxygenation of blood in pulmonary artery: decreased
Dblood pressure in pulmonary artery: increased, blood pressure in aorta: decreased, % oxygenation of blood in pulmonary artery: increased
✓ 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...
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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...
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