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RS 9 Excretion of Metabolic Waste Products, Homeostatic Function,…

- - - - These rejected waste substances osmotically attract some water and in
        24 hours approximately 1- 1.5 L of hypertonic urine is finally passed by the kidney into the ureter which is to be voided periodically by the urinary bladder.
        
        Minimal or ‘obligatory’ volume of the fluid to excrete these waste substance is 500-600 mL/day.
        
        Kidneys cannot concentrate urine more than 5 times the osmolar concentration of the plasma.
- - - - In foetuses and neonates REF is primarily secreted by the liver.
        
        REF increases the number of circulating erythrocytes.
      - 1,25 DHCC (Dihydroxycholecalciferol)
        
        Dietary Vitamin D3 → 25 HOCC → 1,25 DHCC