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Tubular secretion
•Tubular secretion is a passive or active process in which selected substances in the blood are moved into the filtrate.
Tubular secretion function
Eliminating undesirable substances (wastes):
•Urea, uric acid, ammonium ions - passive transport.
Metabolites like drugs, hormones - active transport.
Ridding the body of excess potassium ions – active transport (controlled by aldosterone).
Controlling blood pH: when blood pH drops slightly, the renal tubules will actively secrete more H+ into the filtrate.
Where does tubular secretion occur
Along the renal tubule, especially the DCT.
Table of substances filtered and reabsorbed by the kidney per 24hrs