What three behaviors allow the larynx to perform its most important function?

The most important function of the larynx is not a speech function but a protective function. The larynx prevents foreign bodies from entering the lungs and possibly causing a life-threatening condition. Protection from the entrance of foreign bodies is achieved by means of coughing, throat clearing, and abdominal fixation.

Coughing is the forceful evacuation of the respiratory passageway. Repeated coughing can lead to chronic irritation of the vocal tract and vocal abuse. Throat clearing is less violent than coughing, but still stressful. Clearing of the throat removes mucus from the respiratory track. Abdominal fixation is the process of impounding air in the thorax to stabilize the torso. Abdominal fixation is involved in childbirth, defecation, and vomiting.