explain the mechanism of breathing?
Answers
Answer:
Explanation:
The air which we breathe in and out of the lungs varies in its pressure. So basically when there is a fall in air pressure the alveolar spaces falls and the air enters the lungs (inspiration) and as the pressure of the alveoli within exceeds the atmospheric pressure the air is blown from the lungs (expiration). The flow rate of air is in proportion to the magnitude of the pressure difference.
The breathing mechanism involves two processes:
- Inhalation
- Exhalation
Answer:
The mechanism of breathing in human involves breathing in of air in the lungs and breathing out of air from lungs thoracic cavity. The form is called inspiration and later expiration. The lungs are located in the closed thoracic cavity. A muscular partition called diaphragm separates the thoracic cavity from the abdominal cavity.
During inspiration the diaphragm is lowered due to contraction intercostals muscle. This result into the increase of volume of thorax causing fall of air pressure in the thoracic cavity lowers the pressure in the lungs and the air rushes from outside into lungs through external nares, trachea & bronchi.
During expiration the diaphragm move upward and the lateral thoracic walls move inwards due to the relaxation of muscles of diaphragm and the intercoastals muscles. This decrease the volume of thorax and the pressure inside the thorax and lungs is increased which results in the expulsion of some of air from the lungs to the atmosphere outside the body.
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