Question

explain the mechanism of breathing in human

Answer 1

Mechanism Of Breathing. The action of breathing in and out is due to changes of pressure within the chest (thorax). This action is also known as external respiration, and is created by the muscles of the chest and the diaphragm changing the size of the chest cavity (and air pressure).

Answer 2

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Breathing is a physical process that involves inhalation and exhalation. During inhalation, the diaphragm moves downwards and the chest cavity moves outwards creating the space for air to enter the lungs. When diaphragm moves upwards and the ribs move downwards and inwards , the chest cavity is reduced and air in turn is pushed out. This process is called exhalation. This expansion and relaxation of lungs during breathing also causes a slight visible movement in the abdominal area. The number of times a person breathes per minute is called Breathing rate. It increases while doing physical activities. The average breathing rate of a normal person is 15-20 times per minutes.