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