O-LevelBiologyTransport in Humans5090/11 · May/June 2014 · Q151 Mark

The graph shows the pressure changes in the left atrium and the left ventricle while the heart is beating. [Figure 15.1] When does the atrio-ventricular (bicuspid) valve close?

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APoint A on the time axis (start of ventricular contraction)

BPoint B on the time axis (ventricular pressure exceeds atrial pressure)

CPoint C on the time axis (ventricular ejection phase)

DPoint D on the time axis (end of ventricular relaxation)

✓ Correct answer

B: Point B on the time axis (ventricular pressure exceeds atrial pressure)

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2014 Paper 1 Variant 1, question 15.

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