What reduces friction around the lungs as they expand and contract?
A)pleural fluid
B)mucus
C)surfactant
D)synovial fluid

Question

Quizplus · Accepted Answer

Pleural fluid serves as a lubricant around the lungs, reducing friction as they expand and contract during breathing. Mucus is related to the respiratory system but does not serve this specific purpose. Surfactant is a compound that reduces surface tension within the lungs to prevent their collapse, but it does not directly reduce friction. Synovial fluid is found in joints and is unrelated to the respiratory system.

What Reduces Friction Around the Lungs as They Expand and Contract