2025 · Q24
Which one among the following is the nature of the substance filling up the pleural cavity, the space between the lungs and the chest?
General ScienceHuman biology
- ALiquid
- BDry air
- CHumid air
- DFatty muscle
Explanation
The pleural cavity, the space between the lungs and the chest wall, contains a small amount of pleural fluid, i.e. it is liquid-filled. This fluid lubricates the pleural membranes so the lungs can glide during breathing. It is not filled with air (dry or humid) or fatty muscle.