May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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33Heart CirculationHard1 mark
The graph shows the pressure in three parts of the heart during one cardiac cycle.
Graph of pressure in kPa (vertical axis, 0 to 16) against time in seconds (horizontal axis, 0 to 0.8) for one cardiac cycle, with a dashed curve for the left ventricle rising sharply from about 0.2 s to a peak of about 15 kPa near 0.3 s then falling sharply after 0.4 s, a solid curve for the aorta staying between about 10 and 15 kPa throughout, and a dotted curve for the left atrium that stays low with two small peaks.
At 0.2 seconds, which part of the heart is responding to the excitatory stimulus?
Diagram of the heart's great vessels and atria from the front, with the ventricles shaded grey. Label A points to a vessel entering the top of the heart, label B points to a vessel entering the right side, label C points to the shaded ventricular muscle, and label D points along a line running to the wall of the right atrium near the top of the septum.