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How does the larynx contribute to both speech and breathing?

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Uncover the science behind the transformation of sounds into speech — speech Speech is the faculty of producing articulated sounds, which, when blended together, form language.

The larynx serves as a vital junction between the respiratory and vocal systems, functioning as both a protective gateway and a sound generator.1

Breathing

During quiet respiration, the vocal cords remain apart, creating an open glottis that allows air to pass freely between the lungs and the upper airway. The larynx also acts as a protective mechanism; when swallowing, the entire structure rises, and the epiglottis blocks the entrance to the respiratory tract to prevent food or foreign particles from entering the lungs.12

Speech

For speech, the larynx acts as a phonating sound generator. When air is expelled from the lungs, the vocal cords can be adjusted to narrow the passage. This airflow causes the cords to vibrate, converting the energy of the breath stream into audible sound. While quiet breathing involves symmetrical, rhythmic inhalation and exhalation, phonic respiration requires deeper, more rapid inhalation followed by a slow, controlled exhalation to sustain speech. The precision of this glottal closure is essential for controlling pitch and volume during vocalization.321