Question

Where does the respiratory system begin and end?

Answer 1

The respiratory system begins from nostrils,the air from the nostrils pass through nasal cavity and as the air passes through the nasal cavity it becomes warm,clean and moist.

The clean,moist and warm air goes to trachea and through trachea it passes through bronchi and then to bronchioles and finally in to the alvoeli from which exchange of gases take place.