Increased potassium concentration in extracellular fluid causes the adrenal cortex to secrete aldosterone. ![]() When ADH (antidiuretic hormone) is present, increased sodium concentration in the blood vessels causes water to move by osmosis from the urine into the blood.Īldosterone Control #2 – Potassium Ion Concentration.This causes Chloride and Bicarbonate ions to move out from urine, back into the blood. Sodium ions movement creates a positively charged field in the blood vessels surrounding the kidney tubules.Sodium reabsorption causes Hydrogen ions to pass into the urine to replace positive sodium ions, making the blood less acidic, thus preventing acidosis.Sodium retention and potassium excretion lead to secondary effects: ![]() NOTE: Aldosterone reduces potassium reabsorption, thus, large potassium amounts are lost in urine excretion.
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