Potassium - Revision history

Fiorecastro at 16:31, 12 April 2022

2022-04-12T16:31:21Z

2022-03-25T10:45:07Z

2022-03-16T16:02:10Z

2011-01-20T19:05:45Z

Factors Influencing Potassium Excretion

2010-11-04T21:04:45Z

Renal Control

2010-11-04T21:04:32Z

Methods of Control

2010-11-04T21:03:58Z

Factors Influencing Potassium Excretion

2010-11-04T21:03:45Z

Factors Influencing Potassium Excretion

2010-11-04T21:03:27Z

Factors Influencing Potassium Excretion

2010-11-04T21:02:56Z

Methods of Control

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 *reduced concentration of potassium in the ECF leads to plasma membranes hyperpolarization resulting in decreased firing of action potentials.  This causes skeletal muscle weakness and cardiac abnormalities.
 *increased concentration of potassium in the ECF leads to membrane depolarisation which is inappropriately triggered by action potentials.  This can make the membrane insensitive to further stimulation causing cardiac abnormalities.
 ==Sources of Potassium==
 Potassium is absorbed via passive diffusion from the [[Small Intestine Overview - Anatomy & Physiology|small intestine]] and via active transport from the [[Colon - Anatomy & Physiology|colon]]. It is regulated efficiently by [[Aldosterone|aldosterone]] levels and recovery from cellular breakdown during haemolysis or tissue damage.
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 * The resulting increased cellular uptake of potassium results in it moving down the electrochemical gradient into the nephron
 .Potassium: High potassium = increased potassium excretion which triggers the release of aldosterone.
 [[Category:Electrolytes]]
 [[Category:Minerals]]

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 Complementary tests: [[NationWide Laboratories]]
+[[File:NationWide Logo.jpeg|right|link=https://www.nwlabs.co.uk/|alt=NationWide Logo|240x240px|In Partnership with NationWide Laboratories|frameless|thumb|]]
 [[Category:Electrolytes]]
 [[Category:Minerals]]

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 *reduced concentration of potassium in the ECF leads to plasma membranes hyperpolarization resulting in decreased firing of action potentials.  This causes skeletal muscle weakness and cardiac abnormalities.
 *increased concentration of potassium in the ECF leads to membrane depolarisation which is inappropriately triggered by action potentials.  This can make the membrane insensitive to further stimulation causing cardiac abnormalities.
 ==Sources of Potassium==
@@ Line 47: / Line 48: @@
 * The resulting increased cellular uptake of potassium results in it moving down the electrochemical gradient into the nephron
 .Potassium: High potassium = increased potassium excretion which triggers the release of aldosterone.
 [[Category:Electrolytes]]
 [[Category:Minerals]]

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 * However net reabsorption / secretion of potassium occurs in the distal tubule and first part of collecting duct
 ** Depends on bodies need
-* Under the influence of [[Aldosterone]]
+* Under the influence of [[Aldosterone|aldosterone]]
 * This is where the amount of potassium excreted is determined
 * Reabsorption occurs in the final part of the collecting duct

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 The K<sup>+</sup> in the ECF only represents a very small amount of the total K<sup>+</sup> in the body; however its concentration is maintained within very strict parameters.  The homeostasis of K<sup>+</sup> is managed by three routes:
 #Cellular translocation - this is the main method of control; it is an acute response that triggers Potassium movement either into or out of the cells.
-#Renal excretion - this method makes up 90% of the chronic response (takes 4-6 hours to respond). It allows fine control and is regulated by [[Aldosterone|Aldosterone]]
+#Renal excretion - this method makes up 90% of the chronic response (takes 4-6 hours to respond). It allows fine control and is regulated by [[Aldosterone|aldosterone]]
-#GI excretion - this route makes up the other 10% of the chronic response and becomes significant in cases of renal failure. This response is also influenced by [[Aldosterone]].
+#GI excretion - this route makes up the other 10% of the chronic response and becomes significant in cases of renal failure. This response is also influenced by [[Aldosterone|aldosterone]]
 ==Cellular Translocation==

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 ==Factors Influencing Potassium Excretion==
-#Sodium: High sodium = increased potassium excretion and:
+.Sodium: High sodium = increased potassium excretion and:
 * More sodium into cells
 * Increased Na<sup>+</sup> / K<sup>+</sup> ATPase

← Older revision		Revision as of 21:03, 4 November 2010
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	[[Category:Electrolytes]]		[[Category:Electrolytes]]
−	~~[[Category:Lizard_and_Snake_Glossary]]~~
−	~~[[Potassium - Reptiles]]~~

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 * Pumps sodium into peritubular renal interstitium
 * The resulting increased cellular uptake of potassium results in it moving down the electrochemical gradient into the nephron
-#Potassium: High potassium = increased potassium excretion which triggers the release of aldosterone.
+.Potassium: High potassium = increased potassium excretion which triggers the release of aldosterone.
 [[Category:Electrolytes]]
 [[Category:Lizard_and_Snake_Glossary]]
 [[Potassium - Reptiles]]