First slide

Human Respiratory System

Question

Friction on the lung-surface is prevented by

Moderate

A

pericardial fluid
B

pleural fluid
C

peritoneal fluid
D

synovial fluid

Solution

Two lungs are covered by a double layered pleura, with pleural fluid between them. It reduces friction on the lung-surface.
Synovial fluid - bone joints
Peritoneal fluid - abdominal wall
Pericardial fluid - heart wall

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