Question

Explain the mechanism of breathing

Answer 1

in the process of breathing, the first step is inhalation, breathing of air. then the air gets filtered by the hairs of our nose. after this, the air passes through epiglottis and then is diverted to the wind pipe, also known as pharynx, then passes through larynx, the voice box. then it passes through cartilaginous rings which are the rings which prevent trachea from collapsing, it moves in trachea then gets divided into bronchi, then broncheoles and finally gets into alveolar sacs. then the oxygen is diffused into blood and carbondioxide  is extracted from blood and then it travels through the same path, and the last step is exhalation, breathing out air.

Answer 2

$\Large{\underline{\underline{\bf{Mechanism\: of \: breathing:-}}}}$

Lungs cannot expand or contract of their own. The contraction and expansion of lungs is brought about by diaphragm muscles and external muscles. These muscles brings about alternate expansion and contraction of thoracic cavity wherein the lungs lie. The intake of fresh air into the lungs is called inspiration or inhalation and elimination of foul air is called expiration or exhalation.

The process of breathing is involuntary, but its rate is under the control of the respiratory centre of brain. An average rate of breathing in a normal adult man is 15 to 18 times per minute. The rate of breathing increase at the time of physical activities because the demand of oxygen increase. The rate of breathing increase upto 20 to 25 times per minute during vigorous physical exercise.

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