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The respiratory system consists of:

  • A.the muscles of the chest
  • B.the lungs and the windpipe
  • C.the lungs, the windpipe and the muscles of the chest
  • D.the lungs

Answer: C

The respiratory system as the speech system in phonetics consists of the lungs, the windpipe and the muscles of the chest, which are the source of the airstream. The lungs alone or the lungs and the windpipe do not include the muscles that push the air, so the third option is the fullest answer and the key. In the sound-producing system the lungs supply the air, the windpipe (trachea) carries it up to the larynx where the vocal folds lie, and the chest muscles power the breathing, so all three belong to the respiratory system as it is set out for phonetics.

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