explain the mechanism of breathing in humans
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The action of breathing in and out is due to changes of pressure within the thorax, in comparison with the outside. 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.
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There are two processes inspiration and expiration
in inspiration air moves inwards and in expiration air rushes outwards froms lungs.
during inspiration the space in chest cavity is incresed by the elevation of ribs and downward movement of diaphragm. this increases space in chest cavity thus pressure is reduced so air moves in.
whlie during expiration ribs moves downward diaphragm also relax thus reduced the chest cavity this exerts pressure on lungs and air rushes out.
(i think this will be helpful)
in inspiration air moves inwards and in expiration air rushes outwards froms lungs.
during inspiration the space in chest cavity is incresed by the elevation of ribs and downward movement of diaphragm. this increases space in chest cavity thus pressure is reduced so air moves in.
whlie during expiration ribs moves downward diaphragm also relax thus reduced the chest cavity this exerts pressure on lungs and air rushes out.
(i think this will be helpful)
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