Anatomy of the Human Respiratory System
The respiratory system can be divided into 3 regions:
Nasopharynx Region: the head region, including the nose, mouth,
pharynx, and larynx
Tracheobronchial Region: includes the trachea, bronchi, and bronchioles
Pulmonary (Alveolar) Region: comprised of the alveoli; the exchange
of oxygen and carbon dioxide through the process of respiration
occurs in the alveolar region.