- biological clock---
- an internal timekeeping mechanism capable of driving
or coordinating a circadian rhythm.
- biological rhythm---
- self-sustained cyclic change in a physiological process or behavioral function of an organism that repeats at regular intervals.
- taken from Latin words meaning "around" and "day"
- circadian rhythm---
- a self-sustained biological rhythm which in an organism's natural
environment normally has a period of approximately 24 hours
- a biological rhythm with a period of about one year
- a type of bacteria within genus Synechococcus
- performed in or belonging to the daytime; opposite of nocturnal
- emergence of the adult insect from its pupal case
- self-sustained rhythm generated within an organism
- entraining agent---
- an environmental time cue such as light that has the ability to reset
a biological clock
- producing or creating heat or warmth
- rhythm generated within or by an organism because of rhythmic environmental
cues that are external to the organism
- free running---
- natural self-sustained rhythm that exists in the absence of all
environmental cues. When a human is free running, his/her cycle appears to be
slightly longer than 24 hours.
- the total genetic content of a cell
- one of several species of plants whose flowers or stem buds face east in
the morning, follow the movement of the sun during the day, and face west in
- organism whose internal body temperature is maintained at a relatively
constant temperature through the organism's metabolic activities; its body
temperature typically does not change in response to changes in environmental
temperature fluctuations; homeotherms were once called "warm-blooded"
- small area of the brain near the top of the brain stem; control site of
behaviors such as feeding or drinking, temperature regulation, secretion of
hormones through its effect on the pituitary gland
- describes processes having periods much greater than 24 hours
- a hormone secreted by the pineal gland used as a marker of circadian rhythmicity in humans
- the time that elapses before a rhuthm starts to repeat itself
- the length of light in a light/dark cycle
- organism whose internal body temperature varies with and remains close to
environmental temperature; poikilotherms were once called "cold-blooded"
- rhythmic regular movement
- sleep debt---
- a deficit in normal sleep time
- this term refers to an organism's period length
- of or relating to time
- describes processes having periods much less than 24 hours
- taken from German words meaning "time givers"; an environmental time cue
such as sunlight, food, noise, or social interaction that usually helps reset
the biological clock to a 24-hour day