If symptoms aren't improving in that time, see your doctor to make sure you don't have a bacterial infection in your lungs, larynx, trachea , sinuses or ears.
The conducting portion of the respiratory system includes the nasal cavity, paranasal sinuses, nasopharynx, larynx, trachea , and bronchi.
Minor salivary glands of mucinous type are also located in the nose, paranasal sinuses, the larynx, trachea and bronchi.
The larynx, trachea , and bronchi exhibited extensive squamous metaplasia of the mucosa with reactive atypia.
Additionally, the bronchi, trachea , and larynx demonstrated generalized erythema of the mucosa with overlying thin yellow mucus.
In this theory, the forerunners of wings were thoracic, highly tracheate gills that functioned as stabilizers during swimming.
Myriapods have been traditionally considered the closest relatives of hexapods, thus implying only one origin of terrestriality for the tracheate lineage, but this view is now challenged by molecular evidence.
Nor would they be able to gasp enough oxygen through their tracheae , the breathing system that limits most insects to the half-inch scale.
The fact that insects, chilopods and progoneates (many proponents of the insect-crustacean relationship simply neglect the fact that there are two more tracheate taxa, the symphyles and the pauropods!) all have no visible post-antennular appendage does not make it an A2 that was lost.
Breathing is by special gas exchange organs along the side of the body called tracheae and malpighian tubules.