is yawning a reflex action or not. justify
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Answers
Yawning might serve a social function (to communicate boredom) and a physiological function (regulation of body state). Generally speaking, we cannot yawn on command. It is theorized that yawning is a semi-voluntary action and partly a reflex controlled by neurotransmitters in the hypothalamus of the brain.
short answer- Yawning is a stereotypical reflex characterized by a single deep inhalation (with the mouth open) and stretching of muscles of the jaw and trunk.
long answer- yawning causes an increase in blood pressure, heart rate and oxygen in the blood, which in turn improves motor function and alertness. This might explain why many athletes yawn before playing their respective sports. Yet, current tests have shown that the heart rate, sweating or brain’s electrical activity do not increase after yawning.
Today, scientists continue to research the function(s) of yawning. Pioneer researcher on contagious behavior Dr. Robert Provine suggests that yawning is “associated with the change of a behavioral state- wakefulness to sleep, sleep to wakefulness, boredom to alertness…(Provine, 2005).” And more recent studies have suggested that yawning might be connected to brain temperature (Gallup and Gallup, 2008). When the brain becomes warmer than the homeostatic (stable) temperature, we might yawn to cool the brain. It is theorized that cooler blood from the body floods into the brain and the warm blood circulates out through the jugular vein
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