Question

In order to protect respiratory surface in humans the air passing through nostrils and nasal passage is?

Answer 1

in order to protect the respiratory surface in humans the air passing through nostrils and nasal passage is filtered through the hairs present inside in nostrils,, in order to remove some sort of dust which intend  to enter along with air and in nasal passage there is a  mucus gland( not identify yet) which is verysticky to which the  bacteria get stuck  and thus help in preventing their passage to respiratory surface .so in this way respiratory surface gets protect