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yes, it protect the respiratory system
It collects debris from the air we breathe acting as a filtering system.
yes there are mucous membranes in the respiratory system
Nostrils are mainly what the human race breathes out of, but, other than that purpose, they also help protect it by: Having hairs: the hairs on the inside of your nose (Yes, everybody has them) trap...
It protects our Respiratory System because it helps to remove or exhale the dirt that entered in our body.