205textnotes42 - Water balance: is balance between daily...

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Water balance: is balance between daily water intake and water excretion (Figure 20-2, 20-3; water balance in the body). The kidneys conserve water (see previous lecture on amount of plasma in filtrate and amount that leaves as urine). Changes in blood pressure and osmolarity are the stimuli for water balance reflexes (Figure 20-1) . Concentration of Urine : countercurrent multiplier system : components of the nephron involved: 1. loop of Henle - descending and ascending limb 2. distal tubule 3. collecting duct 4. vasa recta = loops formed by straight arterioles joining with straight venules and running through medulla of kidney - approximately 20% of nephrons have loops of Henle that travel through medulla of the kidney - collecting ducts also run through medulla (Figure 19-1 c, d) . - movement of filtrate through the descending limb and then through the ascending limb is in opposite directions ( counter current ) (e.g. of counter current system Figure 20-9) . - the filtrate and interstitial fluid change composition due to .
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This note was uploaded on 12/26/2011 for the course KIN 205 taught by Professor Blaber during the Fall '09 term at Simon Fraser.

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