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diurnal temperature variation diurnal temperature variation
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Diurnal Diurnal
Diurnal Diurnal organisms are those that are active mainly during the day. When activity patterns of an organism occur in cycles of about twenty-four hours, the pattern is called a circadian rhythm. Diurnal animals, which sleep during the night and are active during the... Read more
autonomous autonomous
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diurnal curve method diurnal curve method
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stimulant stimulant
stimulant any substance that causes an increase in activity in various parts of the nervous system or directly increases muscle activity. Cerebral, or psychic, stimulants act on the central nervous system and provide a temporary sense of alertness and well-being as well as relief from fatigue.... Read more
involuntary muscle involuntary muscle
involuntary muscle (smooth muscle) Muscle whose activity is not under the control of the will; it is supplied by the autonomic nervous system. Involuntary muscle comprises long spindle-shaped cells without striations. These cells occur singly, in groups, or as sheets in the skin, around hair... Read more
parasympathetic nervous system parasympathetic nervous system
parasympathetic nervous system Part of the autonomic nervous system. Its nerve endings release acetylcholine as a neurotransmitter and its actions tend to antagonize those of the sympathetic nervous system. For example, the parasympathetic nervous system increases salivary gland secretion, decreases... Read more
sympathetic nervous system sympathetic nervous system
sympathetic nervous system That part of the autonomic nervous system which generally acts to stimulate the body to cope with stress, such as increasing the rate of heart beat. Nerves of the sympathetic nervous system tend to form ganglia (ganglion) beside the vertebrae, preganglionic fibres leading... Read more
sweating sweating
sweating Sweat is secreted by glands in the skin when it is necessary to lose excess heat from the body. They are stimulated to do so by sympathetic nerves of the autonomic nervous system when sensors in the hypothalamus are activated by blood reaching it at a higher than normal temperature. There... Read more
autonomic nervous system autonomic nervous system
autonomic nervous system (ANS) Part of the body's nervous system that regulates the body's involuntary functions. It helps to regulate the body's internal environment by controlling the rate of heart beat, peristalsis (movements of food through the digestive tract) and sweating. This system is... Read more

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