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Vocal cordThe vocal cords are one group of the features of the human larynx responsible for the production of sound, including speech. They work like a reed instrument, vibrating and modulating the flow of air being expelled from the lungs.Structurally, the vocal cords are a pair of flaps, resembling the valves of the heart, on either side of the larynx. Their tension and shape can be adjusted by muscles. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Vocal cord".