Wednesday, 1 May 2013

HUMAN RESPIRATORY SYSTEM



 


SOURCE-http://www.youtube.com/watch?v=TU4WBbwOWU4

2 comments:

  1. Why is mucus important to the normal functioning of the respiratory system?

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  2. It is present within our nostrils . Mucus is useful in the normal functioning of respiratory system because mucus is the sticky substance which traps the dust particles present in the air it is useful to us to inhale the fresh air so that we cannot fall ill or it does not effect other functions happening in our body.

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