Yawn

A yawn is a reflex conseestin o the simultaneous inhalation o air an the stretchin o the eardrums, follaed bi an exhalation o braith.

Yawn
Joseph Ducreux pandiculatin (baith yawnin an stretchin); sel-portrait c. 1783
Organisms	Vertebrates
Biological seestem	Nervish seestem
Heal	Unaffectit or benefeecial
Action	Involuntar
Stimuli	Fatigue Boredom Stress Sleepiness Ithers mirror neuron reflex
Method	Complete extension o jaw, inhalation, een close, stretchin o he eardrum, exhalation
Duration	8 seiconts