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A yawn is a reflex in vertebrate animals characterized by a long inspiratory phase with gradual mouth gaping, followed by a brief climax (or acme) with muscle stretching, and a rapid expiratory phase with muscle relaxation, which typically lasts a few seconds.
Watch the video above — and read more here — to find out. Merely thinking about or seeing someone yawn can make you yawn (you’re probably yawning right now). ... While yawning is typically ...
Several comfort behaviours are associated with the beginning of a rest period (e.g. grooming), whereas others are associated with the end of a rest period (e.g. stretching), possibly to prepare the body for escape or
328 participants were asked to watch a three-minute video of people yawning and to keep track of how many times they yawned. Of the 328 participants, 222 contagiously yawned.
The stretch reflex (myotatic reflex), or more accurately "muscle stretch reflex", is a muscle contraction in response to stretching a muscle. The function of the reflex is generally thought to be maintaining the muscle at a constant length but the response is often coordinated across multiple muscles and even joints. [ 1 ]
Merely thinking about or seeing someone yawning can make you yawn. But why?
Stretching can be dangerous when performed incorrectly. There are many techniques for stretching in general, but depending on which muscle group is being stretched, some techniques may be ineffective or detrimental, even to the point of causing hypermobility, instability, or permanent damage to the tendons, ligaments, and muscle fiber. [7]
English: Common buzzard yawning while perched on an antenna in the morning, with nictitating membrane visible (deployed asynchronously on left and right eye). Filmed in 10x slow motion (240 frames per second, playback at 24 frames per second) using a Fujifilm XT-4 and an inexpensive 500mm lens.