Physiology of Larynx. Three important functions. The larynx serves three important functions in humans. In order of functional priority, they are protective, respiratory, and phonatory. In humans the protective and respiratory functions are compromised in favor of its phonatory function.
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It is of some interest that the human newborn exhibits similar nasolaryngeal connection by approximation of its epiglottis with the posterior surface of its palate, thus ensuring against aspiration by forming a continuous upper and lower airway .
The nasolaryngeal relationship.
Cough ejects mucus and foreign matter from the lungs and helps maintain patency of the pulmonary alveoli. May be voluntary, but more often in response to stimulation of receptors in the larynx or lower respiratory tract.
inspiratory- larynx opens wide to permit rapid and deep inspiration;
compressive- tight closure of the glottis and strong activation of expiratory muscles;
expulsive- larynx opens widely and a sudden outflow of air in the range of 6-10 liters/sec.
The vocal folds alternately trap and release air; each trap/release is one cycle of vibration. This cycle is often referred to as the glottic cycle, and it is divided into phases: opening phase, open phase, closing phase, closed phase
During the closed phase, the air pressure builds up below the vocal folds. When the glottis opens, the air explodes through the vocal folds, and that's the beginning of the sound wave. The strength of that explosion determines the loudness of the sound coming directly from the larynx.