that is used every day. Speech generation is completely dependent on expiration, this can be seen by trying to talk while inhaling. Using airflow from the lungs, one can control the duration, amplitude, and pitch. While the air is expelled it flows through the glottis causing vibrations, which produces sound. Depending on the glottis movement the pitch of the voice changes and the intensity of the air through the glottis change the volume of the sound produced by the glottis.

Involuntary expiration

Involuntary respiration is

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