Q. 2

Explain the proce

Answer :

The human respiratory system consists of a pair of lungs and a series of air passages leading to the lungs. The entire mechanism of breathing is ruled by two processes inhalation, taking in of oxygen-rich air and exhalation, giving out of the carbon-dioxide-rich air. The air which we breathe in and out of the lungs varies in its pressure. So basically when there is a fall in air pressure the alveolar spaces falls and the air enters the lungs (inhalation) and when the air pressure within the alveoli exceeds atmospheric pressure the air is blown from the lungs (exhalation). The flow rate of air is in proportion to the magnitude of the pressure difference.

The process of breathing consists of two types:


Inspiration or Inhalation: Taking atmospheric air into the lungs. This process is inhalation. And it depends on the pressure inside to the lungs. When atmospheric air pressure is more than the air pressure in lungs, then air enters to the lungs.

Expiration or exhalation: This is the process that involves discharging the air from lungs. When the air pressure in lungs increases and there’s a decrease in the atmospheric pressure then air comes out from lungs into the environment.

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