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<p style="text-align:justify;">Udaka means water. In [[Sharira|body]], water is present in the form of various fluids. Udakavaha srotasa are the channels for transport and transformation of fluid (water) and its circulation. They are the pathways that originate from the palate (talu) or kloma (an internal organ controlling thirst) through which fluids circulate throughout the body. [Code:SAT-B.475]<ref name="ref1">National AYUSH Morbidity and Standardized Terminologies Electronic Portal by Ministry of AYUSH Available on http://namstp.ayush.gov.in/#/Ayurveda</ref> A water-based solution of ions and other compounds makes up most of the adult human body's 60% fluid content. Water makes up most of a cell's primary fluid medium except fat cells. It is present in most cells at a concentration of between 70 and 85 percent.[2] The human body uses water as a construction material, a lubricant, a shock absorber, a solvent, a reaction medium, and a reactant. It also serves as a transporter for nutrients and waste products. Water balance must be managed for the preservation of health and life.[3] So udakavaha srotas are the channels for regulating the water homeostasis in the human body, and failure to do the same can lead to death. This article deals with physiological, pathological and therapeutic aspects of udakavaha srotasa. </p>

<p style="text-align:justify;">Udaka means water. In [[Sharira|body]], water is present in the form of various fluids. Udakavaha srotasa are the channels for transport and transformation of fluid (water) and its circulation. They are the pathways that originate from the palate (talu) or kloma (an internal organ controlling thirst) through which fluids circulate throughout the body. [Code:SAT-B.475]<ref name="ref1">National AYUSH Morbidity and Standardized Terminologies Electronic Portal by Ministry of AYUSH Available on http://namstp.ayush.gov.in/#/Ayurveda</ref> A water-based solution of ions and other compounds makes up most of the adult human body's 60% fluid content. Water makes up most of a cell's primary fluid medium except fat cells. It is present in most cells at a concentration of between 70 and 85 percent.<ref name="ref2">A. C. Guyton and J. E. Hall, Textbook of Medical Physiology. 11th edition. Pennsylvania: Elsevier Saunders, 2006.</ref>The human body uses water as a construction material, a lubricant, a shock absorber, a solvent, a reaction medium, and a reactant. It also serves as a transporter for nutrients and waste products. Water balance must be managed for the preservation of health and life.<ref name="ref3">Jéquier E, Constant F. Water as an essential nutrient: the physiological basis of hydration. Eur J ClinNutr. 2010;64(2):115-23.</ref> So udakavaha srotas are the channels for regulating the water homeostasis in the human body, and failure to do the same can lead to death. This article deals with physiological, pathological and therapeutic aspects of udakavaha srotasa. </p>

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== Etymology and derivation:==

== Etymology and derivation:==

<p style="text-align:justify;">The word udaka is derived from root “undi kledane”.[4] It implies that thing which is to wet is udaka.  

<p style="text-align:justify;">The word udaka is derived from root “undi kledane”.[4] It implies that thing which is to wet is udaka.  

<br/>The word srotas is derived from Sanskrit root “sru”.[4] Meaing of sru is to secrete, to flow. Acharya sushruta defines srotas as tubular structures through which fluid material circulates in the body.[5] [Su. Sa. Sharira Sthana 09/13] Dalhana mentioned two important characteristics of srotas: 1. Passage for fluid  (abhivahanshila) and 2. Hollow space to flow (avakash).[5] [Dalhan on Su. Sa. ShariraSthana 09/13] Srotas, according to acharya Charak, is a structure through which anything is conveyed or flows. [Cha. Sa. Sutra Sthana 30/12]  Udakavaha srotas are the channels for water regulation.

<br/>The word srotas is derived from Sanskrit root “sru”.<ref name="ref4">Amarkosha. Amarsimha, Edited by Pt. Haragovindasastri. Reprint Ed. Varanasi:Chaukhambha Sanskrit Sansthan, 2020.</ref> Meaing of sru is to secrete, to flow. Acharya sushruta defines srotas as tubular structures through which fluid material circulates in the body.<ref name="ref5">Sushruta. SushrutaSamhita. Edited by JadavajiTrikamjiAacharya. 8th ed. Varanasi: ChaukhambhaOrientalia; 2005. </ref>[Su. Sa. Sharira Sthana 09/13] Dalhana mentioned two important characteristics of srotas: 1. Passage for fluid  (abhivahanshila) and 2. Hollow space to flow (avakash).<ref name="ref5">Sushruta. SushrutaSamhita. Edited by JadavajiTrikamjiAacharya. 8th ed. Varanasi: ChaukhambhaOrientalia; 2005.</ref> [Dalhan on Su. Sa. ShariraSthana 09/13] Srotas, according to acharya Charak, is a structure through which anything is conveyed or flows. [Cha. Sa. Sutra Sthana 30/12]  Udakavaha srotas are the channels for water regulation.

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