explain explain the inhalation mechanism of breathing in human beings. draw its diagram please tell it fast it's my exam
Answers
Answer:
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.
Answer:
Breathing is the physical process of inhaling oxygen and exhaling carbon dioxide.
The mechanism of breathing involves two main processes: inspiration and expiration.
Inspiration occurs when the diaphragm and the external intercostal muscles contract.
Expiration occurs when the diaphragm and the intercostal muscles relax.
The contraction or relaxation of muscles around the lungs changes the entire volume of air inside the lungs, and so does the pressure.
If the pressure inside the lungs is more than the outside the air rushes out. If the opposite happens, the air rushes in.
Due to the high elasticity of the lung tissue and low surface tension of moisture in the lungs.
