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Fluid in the pericardial cavity mainly serves to reduce:

AFlotation
BFriction
CFraction
DFixation
Answer & Solution
Correct answer: B. Friction
1. The heart moves constantly. 2. Surfaces must slide over each other. 3. So the fluid reduces friction. _Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._
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