First slide

Mechanism of Breathing

Question

Which of the following occurs during exhalation?

Easy

A

The diaphragm becomes arched upwards
B

Ribs and sternum are raised up
C

External intercostal muscles contract
D

Negative pressure in the lungs with respect to atmospheric pressure

Solution

During exhalation, the diaphragm relaxes and becomes arched upwards. Contraction of external costal muscles, raising of the ribs and sternum occur during inspiration. There is a negative pressure in the lungs with respect to atmospheric pressure during inspiration.

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