respiratory system

Question 1

what is the pathway of air?

Answer 1

air enters the body through the mouth + nose
it then enters the trachea.
the trachea divides into two bronchi
one bronchus enters each lung.
each bronchus branches out into smaller tubes called bronchioles
air travels through these bronchioles.
at the end of the bronchioles the air enters one of the many millions of alveoli

Question 2

where does gaseous exchange take place?

Answer 2

in the alveoli