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Q18 - Reading a Pressure-Volume Loop of the Cardiac Cycle

Theoretical A Real exam question - full text reproduced under IBO's CC BY-NC-SA 4.0 license
Cardiovascular Physiology

A 55-year-old man has a resting cardiac output of 7000 mL/minute. His arterial pressure is 125/85 mmHg. His heart rate is 100 beats/min and his body temperature is normal. Figure Q.18 represents the changes in left ventricular pressure and blood volume during a cardiac cycle.

Figure 1. Figure 1.

Using the information and data, determine which of the statements are true or which are false.

A. At Q, the left atrioventricular valve is opened.
B. Ventricular ejection ends at S.
C. The distance from S to P should be longer if there is a narrowing of the aortic valve.
D. In period R-S, blood does not flow into both atria and ventricles.
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Question reproduced from IBO 2016, Theoretical Paper A, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)