The Pathway of Oxygen goes like this.
The oxygen from the air enters to the nose or mouth, then it follows to the nasal passages or cavity and into the pharynx and larynx. Within of it, the oxygen may flow either to the 2 branches of bronchi and goes through the bronchioles then lastly, the exchange of gas occurs through the tiny airsacs of lungs called alveoli.
Hope it Helps =)
-----Domini----
