Sarthaks Test
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The main functions of respiratory system are given as under: 

i. To exchange oxygen and carbon dioxide between the air and blood. 

ii. To produce sound. It helps vocal chords to produce sound. 

iii. To regulate blood Ph. 

iv. To protect against some micro organism. Respiratory system blocks the entry of microorganism in the body at various levels, thus it provides protection against harmful microorganisms like virus, bacteria, etc.

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