The human respiratory system consists of a series of organs that form a passageway for the air flowing to and from the alveoli of the lungs. The larynx is the central portion.
The other organs are grouped as supra laryngeal or infra-laryngeal. The general functions of the supra laryngeal structures are to condition the in flowing air and to test it.
The nose is the beginning of the respiratory system in humans. These open into a pair of vestibules, one on each side. Like the vestibules, the nasal chambers are separated by a nasal septum, a vertical wall from front to back.
Mucoperiosteal lining is a special combination of tissues, which are rich in blood vessels. This excellent supply of blood furnishes moisture and heat. The greater the surface area, the more efficient will be the conditioning. The conchae are three shelf-like projections that extend from the lateral wall of each nasal chamber.
Thus, a superior, a middle, and an inferior concha are found on each side. During ordinary breathing, the air enters. The olfactory epithelium contains special hair cells that can detect individual molecules found in the air.
Connected with each nasal chamber are cavities found in the middle layer of various skull bones. These cavities are the paranasal sinuses. The function of the paranasal sinuses is unknown.
The two nasal chambers are continuous posteriorly with a single cavity known as the nasopharynx.
The pharyngeal tonsils are a pair of lymphoid aggregates in the upper posterior recess of the nasopharynx.
On each lateral wall of the nasopharynx is a small mound with a slit-like opening. This is the opening of the auditory tube. During swallowing, the soft palate is raised like a trap door to close off the upper air passageways. This prevents movement of food into the upper air passageways.
Log in to save your progress and obtain a certificate in Alison’s free Introduction to the Human Respiratory System online course
Sign up to save your progress and obtain a certificate in Alison’s free Introduction to the Human Respiratory System online course
Please enter you email address and we will mail you a link to reset your password.