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Functions of Organs in Respiratory System. Respiration begins when oxygen enters into the body through the nose and the mouth. The oxygen then travels through the trachea and pharynx where the trachea divides into two bronchi.
The respiratory system, which controls breathing and respiration, consists of the respiratory tract and the lungs. The respiratory tract cleans, warms, and moistens air on its way to the lungs. The tract can be divided into an upper and a lower part.The upper part consists of the nose, nasal cavity, pharynx (throat), larynx, and upper part of the trachea (windpipe).he nose and nasal cavity. The nose is the only external part of the respiratory system. It is made of bone and cartilage (tough connective tissue) and is covered with skin. The two openings to the outside, called nostrils, allow air to enter or leave the body during breathing.