What is the peculiarity of the structure and functions of the upper respiratory tract?

As we know, the respiratory system plays a very important role in the life of every person. With its help, the body is supplied with oxygen, which is necessary for normal life. It is customary to refer to the upper respiratory tract: the nasal cavity, pharynx and larynx. The nasal cavity facilitates the passage of air during breathing. The mucous membrane is well supplied with blood vessels. The nose consists of the nasal bone, concha and cartilage.
The pharynx is formed by joints of muscle tissue and is divided into 3 sections: the nasopharynx, the oropharynx and the hypopharynx. The pharynx passes into the larynx, where further air movement occurs. The larynx contains cartilage that forms the vocal cords.