Question

multiple cholce question
the pericardial cavity contains serous fluid which _________ friction between the pericardial membrane and the heart.
o increases
o reduces

Explanation:

Serous fluid in the pericardial cavity acts as a lubricant. Lubricants are substances that decrease the resistance (friction) between two surfaces in relative motion. In the context of the pericardial membrane and the heart, the serous fluid allows the heart to beat smoothly without excessive rubbing (friction) against the pericardial membrane. If the fluid were to increase friction, it would cause issues like pain and impaired heart function.

Answer:

B. reduces