servile adjective. âº âeager to âserve and âplease someone âelse in a way that âshows a âlack of ârespect for yourself: As a âwaiter, you âwant to be âpleasant to âpeople without âappearing servile. (Definition of servile from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
That is a good question. In fact, it is not really known why horse yawn. Some suggestions for this behavior are the following: 1  Change of sleeping, napping and waking state. 2  Physical fatigue. 3  Mental stress.  Release of mental or physical stress. Horses will often yawn after a chiropractor session or massage session.
So yawning may function in altering the first two variables: increasing arterial blood flow and allowing the flow of cooler blood to the brain.. To answer the question of what happens in the body is fairly straightforward: When you yawn, your mouth gapes open and you inhale deeply, finishing with a short exhalation. During this time, the muscles around your skull contract and stretch and you take in ambient air.