body clock


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body clock

n.
An internal mechanism of the body that is thought to regulate physical and mental functions in rhythm with normal daily activities.

circadian rhythm

physiological variations over 24 h, generated by a 'clock' in the brain (nerve centres in the hypothalamus, with input from the eyes); normally synchronized to the light-dark cycle, but effective even in conditions without cues from light or time. Influenced by the hormone melatonin from the pineal gland. Circadian means 'about a day'. Variables affected include body temperature, alertness and sleepiness, urine output, cortisol secretion. See also jet lag.
References in periodicals archive ?
University of Surrey researchers examined the impact of altering meal times on the body clocks of 10 volunteers, who were given breakfast, lunch and dinner.
Interestingly, all the students slept for about the same amount of time, but their body clocks varied.
The findings may help explain why shift workers, whose body clocks are routinely disrupted, are more prone to health problems, including infections and chronic disease.
receiving vaccines " When the body clock was disrupted in either individual cells or mice, researchers found that the timing of infection no longer mattered - viral replication was always high.
Our study, which was conducted during the Phoenix Mars Lander mission, investigated the effectiveness of a pilot program to educate the mission personnel on how to reset their body clocks more quickly and how to improve their sleep, alertness, and performance," he said.
The game can be played individually or multiple players can compete to have the most accurate internal body clock.
The skins, say the scientists, are packed with melatonin, the hormone that regulates your body clock and tells you when it's time to go to sleep.
Occasionally a rooster -- one whose body clock was in desperate need of recalibration -- would burst into frenzied crowing.
Indeed, he told Science News, "trying to engage socially at a time their body clock is telling them to sleep may exacerbate their [psychosis].
The pineal gland, an endocrine gland located in the brain above the hypothalamus, helps to regulate the body clock.
This might be an entrance to the whole mysterious arena of how metabolic conditions in an animal can synchronize themselves with a body clock," said Dr.