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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 is a collection of organs whose primary function is to take in oxygen and expel carbon dioxide. The major organs of the respiratory system are the lungs, nose, pharynx, and throat.he Muscular system is the organ system whose primary function is movement and flexibility. The muscular system is made up of the muscles that let you move. There are three kinds of muscle in your body. Smooth muscle moves food through the digestive system.