1.

Explain the process of inspiration.

Answer»

Inspiration:

1. The entry of air into the lungs is called as inspiration or inhalation. 

2. It involves: 

  • Contraction of the diaphragm muscles. As a result, it moves downwards i.e. the diaphragm becomes flat. 
  • Contraction of external intercostal muscles & relaxation of internal intercostal muscles. As a result, the ribs move outward & forward i.e. anteroventral movement of the ribs. 
  • The above changes in the factors cause an increase in the thoracic volume but the thoracic pressure is reduced. Hence, due to less pressure air enters into the lungs.


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