one oxygen molecule
as it is inhaled

Nose

Oxygen molecule enters
the nose and moves to
the nasal cavity.

Nasal Cavity

Pharynx

The oxygen molecule
then moves to the
Pharynx and into the
Trachea.

Trachea

The trachea carries the
oxygen to the bronchi.

Bronchi

The bronchi would carry
the oxygen molecules into the
the lungs by way of smaller and
smaller branches called bronchioles

Bronchiole

Alveoli

The oxygen molecule would then
pass through the alveolar wall
and capillary wall into the
blood stream.