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Constriction & Retraction
The Larynx can close at the vocal folds and false vocal folds.
The Larynx closes at both of these points during - bracing, lifting heavy objects, giving birth, coughing, clearing your throat and having a POO!
False Vocal Folds (Ventricular Folds).
False Vocal Folds can close, reducing the airspace above the true folds or closing altogether - this is known as ‘constriction’. Imagine lifting a heavy object.
Using positive effort these false folds can be retracted to enable free movement of the vocal folds - this is known as ‘retraction’. Imagine a silent laugh/smile in your throat.