What changes do you observe in your body during expiration process?

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Solution

The process of breathing (respiration) is divided into two distinct phases, inspiration (inhalation) and expiration (exhalation).
During inspiration, the diaphragm contracts and pulls downward while the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.
During expiration, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out.

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