Question

explain the mechanism of breathing in human beings .

Answer 1

In order for air to be drawn into the lungs during inhalation, the volume of the thorax must increase. This is brought about do to the contraction of respiratory muscles. The diaphragm relaxes and moves up and the relaxation of the intercostal muscles moves the ribs up and down.

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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.