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biological rhythm

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basic rest-activity cycle

basic rest-activity cycle  

A biological rhythm of waxing and waning alertness with a period of approximately 90 minutes in humans. During sleep it controls the cycles of REM and slow-wave sleep. Also called the rest-activity ...
biological clock

biological clock  

1. any mechanism that allows expression of specific genes at periodic intervals. 2. any physiological factor that regulates body rhythms. See clock mutants.
biological rhythms

biological rhythms   Reference library

The Oxford Companion to the Body

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology, Life Sciences
Length:
1,683 words
Illustration(s):
1

Life has evolved in a rhythmic environment. For example, the daily rising and setting of the sun, and the seasonal

biological rhythm

biological rhythm   Quick reference

The Oxford Dictionary of Sports Science & Medicine (3 ed.)

Reference type:
Subject Reference
Current Version:
2007
Cyclical changes that recur regularly over a given length of time and are related to underlying physiological processes. In humans, the length of a cycle (known as the period) varies from ... More
biorhythm

biorhythm  

Reference type:
Overview Page
A roughly periodic change in the behaviour or physiology of an organism that is generated and maintained by a biological clock. Well-known examples are the annual and circadian rhythms occurring in ...
chronobiology

chronobiology  

The branch of biology concerned with biological rhythms. See biological clock, biological rhythm. See also alpha wave, basic rest-activity cycle, beta wave, circadian rhythm, circannual rhythm, delta ...
circadian rhythm

circadian rhythm  

Any 24-hour periodicity in the behaviour or physiology of animals or plants. Examples are the sleep/activity cycle in many animals and the growth movements of plants. Circadian rhythms are generally ...
circannual rhythm

circannual rhythm  

Any biological rhythm involving a biological or psychological process that occurs or fluctuates at intervals of approximately one year, even in controlled environments from which seasonal cues have ...
circaseptan rhythm

circaseptan rhythm  

Any biological rhythm with a period of approximately seven days. [From Latin circa about + septem seven]
hangover

hangover  

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Overview Page
Headache and feeling of malaise resulting from excessive consumption of alcoholic beverages. The severity differs with different beverages, and is due to both the toxic effects of alcohol and the ...
infradian rhythm

infradian rhythm  

Any biological rhythm with a period of less than a day. See alpha wave, basic rest-activity cycle, beta wave, delta wave, gamma wave, sensorimotor rhythm, theta wave. See also biological clock, ...
pacemaker neuron

pacemaker neuron  

Any of a number of different nerve cells in the autonomic nervous system that trigger regular cyclic activities, such as heartbeat, breathing, and EEG waves. The suprachiasmatic nucleus is thought to ...
rhythm

rhythm  

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Overview Page
Subject:
Music
Covers everything pertaining to the time aspect of mus. as distinct from the aspect of pitch, i.e. it incl. the effects of beats, accents, measures, grouping of notes into beats, grouping of beats ...
suprachiasmatic nucleus

suprachiasmatic nucleus  

A region of the hypothalamus, immediately above the optic chiasm, that generates the endogenous circadian rhythm. It receives inputs from specialized melanopsin-containing retinal ganglion cells and ...
ultradian

ultradian  

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Overview Page
adj. denoting a biological rhythm or cycle that occurs more frequently than once in 24 hours. Compare circadian; nyctohemeral.

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