A-LevelBiologyTransport in mammalsMay/June 2012Paper 1 Q301 Mark
The stroke volume is the volume of blood pumped by each contraction of a ventricle. The ventricular end-diastolic volume is the volume of blood in the ventricle just before systole. Which graph shows the relationship between the stroke volume and the ventricular end-diastolic volume?
AGraph showing stroke volume constant at 100 cm³ regardless of ventricular end-diastolic volume.
BGraph showing stroke volume decreasing linearly from 200 cm³ to 0 cm³ as ventricular end-diastolic volume increases from 0 cm³ to 200 cm³.
CGraph showing stroke volume increasing linearly from 0 cm³ to 200 cm³ as ventricular end-diastolic volume increases from 0 cm³ to 200 cm³.
DGraph showing stroke volume increasing with increasing ventricular end-diastolic volume, starting from 0 and curving upwards, then levelling off around 150 cm³.
✓ 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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