|
Friction on the lungs surface reduces by |
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|
a) |
Double layered pleura |
b) |
Single layered pleura |
|
c) |
Ribs covering lungs |
d) |
Mucous membrane surrounding the lungs |
|
Friction on the lungs surface reduces by |
|||
|
a) |
Double layered pleura |
b) |
Single layered pleura |
|
c) |
Ribs covering lungs |
d) |
Mucous membrane surrounding the lungs |
(a)
Humans have two lungs, which are covered by a double membrane called pleura, with pleural fluid between them. Pleural fluid reduces the friction on the lung surface. The outer pleural membrane is in close contact with the thoracic lining whereas the inner pleural membrane is in the contact with the lung surface