hibernation


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hibernation

 [hi″ber-na´shun]
a dormant state in which certain animals pass the winter, marked by deep sleep and sharp reduction in body temperature and metabolism.
artificial hibernation a state of reduced metabolism, muscle relaxation, and a twilight sleep resembling narcosis, produced by controlled inhibition of the sympathetic nervous system and causing attenuation of the homeostatic reactions of the organism.

hi·ber·na·tion

(hī'bĕr-nā'shŭn),
A torpid condition in which certain animals pass the cold months. True hibernators, such as woodchucks, ground squirrels, dormice, and some others, have body temperatures reduced to near the freezing point, with a very slow heartbeat, low metabolism, and infrequent respirations. Partial hibernators, such as bears, skunks, and raccoons, have reduced physiologic activity during the cold months, but they are not comatose. Compare: estivation.
Synonym(s): winter sleep
[L. hibernus, relating to winter]

hibernation

/hi·ber·na·tion/ (hi″ber-na´shun)
1. the dormant state in which certain animals pass the winter, marked by narcosis and by sharp reduction in body temperature and metabolism.
2. an analogous temporary reduction in function, such as of an organ.

artificial hibernation  a state of reduced metabolism, muscle relaxation, and a twilight sleep resembling narcosis, produced by controlled inhibition of the sympathetic nervous system and causing attenuation of the homeostatic reactions of the organism.
myocardial hibernation  chronic but potentially reversible cardiac dysfunction caused by chronic myocardial ischemia, persisting at least until blood flow is restored.

hibernation

[hī′bərnā′shun]
Etymology: L, hibernare, to winter
a natural physiological state or process wherein a generalized slowdown in metabolic and body functions produces a somnolescent condition and in which body temperature is maintained at a lower level than normal. It is a survival mechanism used by some species of birds and mammals to cope with periods of low temperature and reduced food supply.
Cardiology Myocardial hibernation
Physiology Astate of winter dormancy and hypothermia seen in bears and other animals

hi·ber·na·tion

(hī'bĕr-nā'shŭn)
A torpid condition in which some animal species pass the cold months.
Compare: estivation
Synonym(s): winter sleep.
[L. hibernus, relating to winter]

hibernation

a state of dormancy entered into by many animals during the winter, particularly those in cooler latitudes. Some temperate and arctic mammals, reptiles and some amphibians hibernate and, in this state, the METABOLISM is slowed down and the body temperature falls. Hibernation is generally triggered by cold weather and whilst body temperatures in mammals normally are maintained at the usual level, they may fall much lower and near to freezing point (in e.g. hamster), or to that of the surroundings (in e.g. bat).

True hibernators tend to be mid-sized animals as these can have sufficient food reserves without too large a surface area for heat loss. Bears are not true hibernators as their body temperature does not drop and they are able to awake from their winter ‘sleep’ very quickly. In temperate situations, rises in temperature may cause some animals temporarily to come out of hibernation. Compare AESTIVATION (1).

hibernation

the dormant state in which certain animals pass the winter, marked by narcosis and by sharp reduction in body temperature and metabolism.

artificial hibernation
a state of reduced metabolism, muscle relaxation, and a twilight sleep resembling narcosis, produced by controlled inhibition of the sympathetic nervous system and causing attenuation of the homeostatic reactions of the organism. Induced hypothermia has had experimental use as an anesthetic medium for extensive surgical operations in humans.
References in periodicals archive ?
Philae had been in hibernation since November when it became the first spacecraft to touch down on the surface of a comet.
The lander had been in hibernation since November shortly after it touched down on speeding comet 67P - 300 million miles away.
Shortly after its historic landing, Philae managed to conduct experiments and transmit data for about 60 hours before its batteries were depleted and it was forced into hibernation.
Passware has found a way to acquire the token from a live memory image and, which is more applicable, from a Windows hibernation file.
While the probe is now out of its hibernation phase, it will still take seven months to reach its closet point from Pluto, passing within 12,500 kms of the planet's surface in July 2015.
These include promoting growth during early life and fattening prior to hibernation, as well as slowing ageing processes" added Giroud.
It first imaged the comet in a long exposure of over 13 hours from a distance of 163 million kilometers, three years ago, before entering deep-space hibernation.
Rosetta was put into hibernation in 2011 to conserve energy for its long journey to meet with comet 67P/Churyumov-Gerasimenko.
The hibernation habits of lemurs have the potential to allow humans to travel deep into space.
This release includes Fresh Hop Pale Ale, Oak Aged Yeti Imperial Stout, and Hibernation Ale.
That unusually warm week did indeed result in the emergence of an incredible amount of wasps, queens coming out of hibernation thinking that it was spring.
All they had left to remind them of him was his brother Clive, who was eventually put into hibernation in the house all by himself.