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Also known as the voice box, the larynx is composed of cartilage that contains the apparatus for voice production. This includes the vocal cords and the muscles and ligaments that move the cords. Mentioned in: Cough, Croup, Epiglottitis, Laryngectomy, Laryngitis, Leishmaniasis, Tracheotomy.
Muscles inside the larynx adjust the position, shape, and tension of the vocal cords, allowing us to make different sounds from whispering to singing. Any change in the air flow (which is generated by the lungs exhaling air) across the vocal cords will affect the voice and the quality of the sound.