Question

describe the mechanism of breathing in humans​

Answer 1

The process of taking air into and expelling it from the lungs is called breathing. The action of breathing in and out is due to changes of pressure within the thorax, in comparison with the outside. ... When we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity.

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Answer 2

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• Mechanism of Breathing in Human beings: Breathing is a complex mechanical process that involves muscular movement which in turn alters the volume of the thoracic cavity and thereby that of the lungs.

• Breathing occurs involuntarily but its rate is controlled by the respiratory centre of brain. The space of thoracic cavity increases or decreases by outward and inward movements of the ribs caused by external intercostal and internal intercostal muscles.

• This action is also assisted by the contraction and expansion of the diaphragm. The floor of the thoracic cavity is completely closed by diaphragm. It is a thin muscular septum separating the abdominal and thoracic cavities.

• The inhalation and exhalation of the air take place continuously in the respiratory system.Inspiration or inhalation is concerned with the takingin of atmospheric air or oxygen into the thoracic cavity. Expiration or exhalation is concerned with the expelling of carbon dioxide from lungs. It takes place when the volume of the thoracic cavity decreases and the pressure of the contained air in the thoracic cavity increases.

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