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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 human respiratory system. The respiratory system is made up of the mouth, throat, nose, sinuses, bronchial tubes, and lungs. The diaphragm's main function is to control breathing. The respiratory and abdominal organs.fter the exchange of gases in the lungs, oxygenated blood usually enters the circulatory system to reach all parts of the body. Any disturbance in the components that regulate the breathing process can affect the function of the respiratory system.