Electrophysiology Unit (EPU) Practice Exam

In a healthy person, the pericardial sac contains approximately how many milliliters of fluid?

15-50 ml 50-100 ml 1-2 ml 100-150 ml

Correct Answer:

15-50 ml

Explanation:

The key idea is that the pericardial space normally holds only a small amount of lubricating fluid to allow the heart to move smoothly within the sac. This serous fluid reduces friction as the heart beats, so the heart’s surfaces slide against each other without drag. In a healthy person, the balance is a modest volume—enough to lubricate but not so much that the space enlarges or compresses the heart. If the fluid volume were much larger, it would indicate a pericardial effusion, which can impair heart function and is not normal. So the correct choice reflects this small, physiological lubricant amount rather than a very small or a very large quantity.

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