The acid is excreted from kidney as follows:
1. Sodium salt of mineral or organic acids are removed from
the plasma by glomerular filtration.
2. Sodium is preferentially removed from the renal filtrate or
tubular fluid in the tubular cells. The process known as sodium hydrogen
exchange.
3. The sodium bicarbonate returns to plasma (eventually being
removed in the lungs as CO2) and protons enter tubular fluid,
forming acids of the anions that originally were sodium salts.
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