The theories regarding why people yawn range from boredom to cooling the brain to helping the brain to stay more alert. Regardless of what causes yawning, it is widely accepted that yawning is contagious.Know More
According to the Huffington Post, sleep researchers are stumped on how yawning relates to sleep, but acknowledge that it often occurs in response to fatigue.
According to BGR, research from the University of Vienna suggests yawning helps to cool the brain, thereby keeping a person more alert and less inclined to fall asleep in inappropriate or unsafe circumstances. The research shows that yawning occurs less frequently when the ambient temperature is very hot or cold, suggesting that the act of yawning is indeed related to temperature.
Psychology Today reports that research has shown that yawning is tied to boredom and the power of suggestion, with most people yawning in reaction to seeing another person yawn. The paraventricular nucleus portion of the brain's hypothalamus emits a signal that causes a human being to yawn. This section of the brain also generates a hormone that increases significantly when a person is asleep and just before he awakes. Researchers say this may explain why most people yawn shortly after getting out of bed each morning.Learn more in Human Anatomy
Each nostril communicates more directly with a specific hemisphere of the brain, according to Science IQ. Researchers at Monell Chemical Senses Center, which studies the sense of smell, showed in an experiment that the left nostril communicates with the left hemisphere and the right nostril with the right hemisphere.Full Answer >
The brain is the fattiest organ in the human body and is composed of roughly 60 percent fat. It is considered the center of the vertebral nervous system and is located in the head of all vertebrates.Full Answer >
The cochlea is the auditory center of the inner ear, a fluid-filled organ that translates the vibrations of auditory sound into impulses the brain can understand. This occurs at the organ of Corti, a structure consisting of tiny hairs throughout the cochlea that vibrate and send electrical signals through the nervous system.Full Answer >
The eyes, the joints and muscles and the vestibular organs in the inner ears control a body's balance by sending nerve signals to the brain. Dysfunction in any one of these systems can result in loss of balance.Full Answer >