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When air from the lungs is passed over the vocal cords inside the larynx, they vibrate. This makes a sound. The vocal cords are tightened or relaxed to change their length. This changes the speed of vibration which alters the pitch. If only the larynx is involved, the sound comes out as a dull 'aaah' in varying pitch. No recognisable words can be formed without the use of the lips, teeth, tongue and palate. This is why people with serious facial injuries or with many teeth missing often have trouble speaking or being understood.

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17y ago

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