The organs that part of the
respiratory system can divided into
three : lungs, airway and
muscles.

The lungs the right and left
lungs made alveoli where gas
(entrance of oxygen exit
of carbon ) takes place; the
are covered by pleura (a
serous ). The airway
comprehends nose, the pharynx,
larynx (including the cords),
the trachea, bronchi and the
. The muscles upon
the breathing process are
mainly the and the
intercostal (muscles between
the ).