1.

Differentiate between inhalation and exhalation.

Answer»

Inhalation: 

  • The muscles of the diaphragm contract. 
  • The diaphragm goes downward. 
  • The ribs move upwards and outwards.
  • The volume of thoracic (chest) cavity increases. 
  • Air enters the lungs through the nose.

Exhalation: 

  • The muscles of the diaphragm relax. 
  • The diaphragm goes upward. 
  • The ribs move downwards. 
  • The volume of thoracic (chest) cavity decreases. 
  • Air goes out of the lungs through the nose.


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