Question

Explain the machanism of breathing in human beings

Answer 1

Answer:This action is also known as external respiration. When we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity. ... This reduces the size of the thoracic cavity, thereby increasing the pressure and forcing air out of the lungs.

Breathing (or pulmonary ventilation) has two phases - inspiration (or inhalation) and expiration (or exhalation). It is a mechanical process that depends on volume changes in the chest cavity. The volume changes result in pressure changes, which lead to the flow of gases to equalise the pressure.

Answer 2

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• The breathing in human beings takes place through the organs called lungs. The taking in of air rich in oxygen into the body during breathing is called 'inhalation' and giving out (or expelling) the air rich in carbon dioxide is called 'exhalation'. Both, inhalation and exhalation take place regularly during breathing ...