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Created page with 'File:lighterstill.jpgright|frame ==Origin== [http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-150...'
[[File:lighterstill.jpg]][[File:A-Mortally-Wounded-Brigand-Quenches-His-Thirst_2.jpg|right|frame]]
==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from [http://nordan.daynal.org/wiki/index.php?title=English#ca._600-1100.09THE_OLD_ENGLISH.2C_OR_ANGLO-SAXON_PERIOD Old English] thurst; akin to Old High German durst thirst, [[Latin]] torrēre to dry, parch, Old Irish tart dryness, thirst, [[Greek]] tersesthai to become dry
*[http://en.wikipedia.org/wiki/12th_century Before 12th Century]
==Definitions==
*1a : a sensation of dryness in the mouth and throat associated with a [[desire]] for liquids; also : the bodily condition (as of [http://en.wikipedia.org/wiki/Dehydration dehydration]) that induces this sensation
:b : a desire or need to drink
*2: an ardent [[desire]] : craving, longing <a thirst for success>
==Description==
'''Thirst''' is the craving for fluids, resulting in the basic [[instinct]] of [[animals]] to drink. It is an [[essential]] [[mechanism]] involved in fluid [[balance]]. It arises from a lack of fluids and/or an increase in the [[concentration]] of certain [http://en.wikipedia.org/wiki/Osmolite osmolites], such as [[salt]]. If the [[water]] volume of the [[body]] falls below a certain threshold or the osmolite [[concentration]] becomes too high, the [[brain]] [[signals]] thirst.
Continuous [http://en.wikipedia.org/wiki/Dehydration dehydration] can cause many [[problems]], but is most often [[associated]] with neurological problems such as seizures and [http://en.wikipedia.org/wiki/Kidney renal] problems.
Excessive thirst, known as [http://en.wikipedia.org/wiki/Polydipsia polydipsia], along with excessive urination, known as [http://en.wikipedia.org/wiki/Polyuria polyuria], may be an indication of [http://en.wikipedia.org/wiki/Diabetes diabetes].
There are receptors and other systems in the [[body]] that detect a decreased volume or an increased [http://en.wikipedia.org/wiki/Osmolite osmolite] [[concentration]]. They [[signal]] to the central [[nervous system]], where central processing succeeds. Some sources, therefore, distinguish "extracellular thirst" from "intracellular thirst", where extracellular thirst is thirst generated by decreased [[volume]] and intracellular thirst is thirst generated by increased osmolite concentration. Nevertheless, the craving itself is something generated from central processing in the [[brain]], no matter how it is detected.[http://en.wikipedia.org/wiki/Thirst]
[[Category: Biology]]
==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from [http://nordan.daynal.org/wiki/index.php?title=English#ca._600-1100.09THE_OLD_ENGLISH.2C_OR_ANGLO-SAXON_PERIOD Old English] thurst; akin to Old High German durst thirst, [[Latin]] torrēre to dry, parch, Old Irish tart dryness, thirst, [[Greek]] tersesthai to become dry
*[http://en.wikipedia.org/wiki/12th_century Before 12th Century]
==Definitions==
*1a : a sensation of dryness in the mouth and throat associated with a [[desire]] for liquids; also : the bodily condition (as of [http://en.wikipedia.org/wiki/Dehydration dehydration]) that induces this sensation
:b : a desire or need to drink
*2: an ardent [[desire]] : craving, longing <a thirst for success>
==Description==
'''Thirst''' is the craving for fluids, resulting in the basic [[instinct]] of [[animals]] to drink. It is an [[essential]] [[mechanism]] involved in fluid [[balance]]. It arises from a lack of fluids and/or an increase in the [[concentration]] of certain [http://en.wikipedia.org/wiki/Osmolite osmolites], such as [[salt]]. If the [[water]] volume of the [[body]] falls below a certain threshold or the osmolite [[concentration]] becomes too high, the [[brain]] [[signals]] thirst.
Continuous [http://en.wikipedia.org/wiki/Dehydration dehydration] can cause many [[problems]], but is most often [[associated]] with neurological problems such as seizures and [http://en.wikipedia.org/wiki/Kidney renal] problems.
Excessive thirst, known as [http://en.wikipedia.org/wiki/Polydipsia polydipsia], along with excessive urination, known as [http://en.wikipedia.org/wiki/Polyuria polyuria], may be an indication of [http://en.wikipedia.org/wiki/Diabetes diabetes].
There are receptors and other systems in the [[body]] that detect a decreased volume or an increased [http://en.wikipedia.org/wiki/Osmolite osmolite] [[concentration]]. They [[signal]] to the central [[nervous system]], where central processing succeeds. Some sources, therefore, distinguish "extracellular thirst" from "intracellular thirst", where extracellular thirst is thirst generated by decreased [[volume]] and intracellular thirst is thirst generated by increased osmolite concentration. Nevertheless, the craving itself is something generated from central processing in the [[brain]], no matter how it is detected.[http://en.wikipedia.org/wiki/Thirst]
[[Category: Biology]]