Trachea
In this part of the respiratory tract there are certain cells with vibrating filaments know as cilia.
The presence of nooks and crannies in this section of the respiratory tract increases the lenght of the journey air goes within the body, making it warmer.
They don't have cartilage rings.
In the first section, the internal wall has several capillaries, which warm up the air because they carry blood.
It has open cartilage rings at its back.
In this section, air is purified and humidified.
They branch into progressively smaller ducts.
There's mucous present in the interior of this section that traps foreign particles in the air.
Pharynx
This area is common to the respiratory and digestive tracts. Foods continue their journey into the esophagus, while air passes into the larynx.
It's about 12 cm long.
On the sides of this airway there are tonsils, which produce white blood cells.
The walls of this tube are formed of cartilage that continually keeps it open.
Bronchioles
They are two airways.
Nasal cavity
Bronchi
Each tube enters a different lung.
They end in tiny sacts, called pulmonary alveoli.
Larynx
Entry to this area is regulated by a fibrous structure known as the epiglottis, which closes when food is being ingested to prevent the organism from choking or suffocating.
Where air enters the body.
