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Distal Tubule

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  • Distal (convoluted) Tubule
    • Physiologically-controlled reabsorption
      • Aldosterone increases Na+ reabsorption and K+ secretion
        • Reabsorption of sodium, calcium
          • Na+ coupled to water reabsorption, increasing blood pressure 
        • Secretion of potassium
        • Acid-base balance
          • By secreting H+ and reabsorbing bicarbonate
      • Antidiuretic hormone (ADH/vasopressin) increases water reabsorption via aquaporins