Does any part of our body vibrate when we speak? Name the
part.
NCERT Class VIII
Science - Exemplar Problems
Chapter 13. Sound
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Yes, many parts like tongue,voice box,epiglottis etc.
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-->Human beings produce sound by using the voice box which is called as Larynx.
-->It is situated at the top of the wind pipe(trachea).
--->The Larynx contains two ligaments known as Vocal cords.
---->Sound is produced by the vibration of these vocal cords.
---> when we speak, the muscle of vocal cords contract due to which two vocal cords, become stretched and close together leaving only a narrow slit between them,
---> The lungs, pass a current of air between the two vocal cords, this air makes the vocal cords vibrate and vibrating vocal cord produces sound.
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