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Respiration


Respiration


          The process of taking oxygen from atmosphere and giving out Carbon dioxide is called respiration. Human takes in about 1.3 cubic foot air in his whole life. Respiration has divided in to types- 

Cellular or internal respiration-

          Diffusion of oxygen in blood in alveoli and coming carbon-di-oxide in alveoli from blood is known as cellular respiration.

External or pulmonary respiration-

         Absorbing oxygen by cells carried by blood and carried out Carbon dioxide from inside is the last chemical reaction of respiration. When air pressure inside lungs is more than air pressures of out side the body, internal air comes out. It is called expiration while air pressure of the atmosphere is more than air pressure inside the body; air goes inside the lungs and is called inspiration.

Mechanism of Respiration:

There are two parts of respiration- inspiration and expiration.

       During inspiration, both intercostals muscles and diaphragm get contracted altogether by becoming stimulated from the nerves and because of this reason the volume of chest cavity gets increased and the lungs which have the quality of elasticity expand to fill this vacant place. When the lungs expand, the pressure in the alveoli present in the lungs gets reduced to the temperature of outer atmosphere and because of this reason the atmosphere air gets enter into the air sacks of lungs by going through the respiratory tube. This process is called inspiration because through this process atmosphere air enters into the lungs. 

Expiration:

     During expiration, both intercostals muscles and diaphragm both become loose. The chest cavity becomes contracted because of their looseness and because of this reason pressure falls on the lungs and the carbon dioxide present in the lungs exhales from the lungs. Exhaling air is called expiration.  

     Above mentioned both processes-inspiration and expiration remain continue throughout life. It is a self exciting process. Because of this reason, the process of inhaling and exhaling air remains continue throughout life.