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| Description: Tubule Osmolarity ↑ in descending limb ↓ in ascending limb ↓ in collecting duct Urine Production Fluid intake is highly variable. Homeostasis requires maintenance of fluid volumes within specific limits. Urine concentration varies with ADH. High intake – Dilute urine of high volume Low intake – Concentrated urine of low volume Glomerular filtrate and blood have the same osmolarity – 300mOsm/Liter Tubular osmolarity changes due to a concentration gradient in the medulla When dilute urine is formed, osmolarity in the tubule Increases in the descending limb Decreases in the ascending limb Decreases more in the collecting duct Picture Stats: Views: 153 Filesize: 919.64kB Height: 881 Width: 708 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40864 |