Explain the mechanism by which humans regulate their body temperature.

Explanation

The breathing mechanism involves two processes:
Inspiration
Expiration
Mechanism Of Inspiration:
The process of intake of atmospheric air is known as inspiration. It is an active process.
When the volume of the thoracic cavity increases and the air pressure decreases, inspiration takes place.
Contraction of external intercostal muscles increases the volume of the thoracic cavity.
Contraction of the diaphragm further increases the size of the thoracic activity. Simultaneously, the lungs expand.
With the expansion of the lungs, the air pressure inside the lungs decreases.
The pressure equalizes and the atmospheric air rushes inside the lungs.
Mechanism of Expiration:
The process of exhaling carbon dioxide is called expiration. It is a passive process.
It occurs when the size of the thoracic activity decreases and the air pressure outside increases.
Now the external intercostal muscles relax and the internal intercostal muscles contract.
As a result, the ribs are pulled inward and the size of the thoracic cavity is reduced.
The diaphragm is relaxed and the lungs get compressed.
Consequently, the pressure increases and the air is forced outside.