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Reabsorption and Secretion Along the Loop of Henle - Anatomy & Physiology (view source)
Revision as of 13:35, 4 September 2008
, 13:35, 4 September 2008→Transport
** Potassium is then cleared from the cells using a co-transporter with chlorine
** Potassium is then cleared from the cells using a co-transporter with chlorine
* Cations (e.g. sodium, potassium, calcium and magnesium) can passively move paracellulary into the [[Vasa Recta - Anatomy & Physiology | vasa recta]]
* Cations (e.g. sodium, potassium, calcium and magnesium) can passively move paracellulary into the [[Vasa Recta - Anatomy & Physiology | vasa recta]]
===Urea Recirculation===
The urea from the collecting duct enters the medullary interstial fluid and diffuses into the loop of henle. As it passes back up the ascending limb of the loop of henle and reabsorption of other ions occurs the urea becomes even more concentrated. This recirculation can occur several times and steadily increases urea concentration in the medullary tissue until equilibrium is reached. If water conservation is important this equilibrium is not reached until the urine is more concentrated and urea makes up 40% of the interstial osmolarity. The overall aim of this recirculation is to excrete a high concentration of urea in very little water.
==Countercurrent System==
==Countercurrent System==