Ammonia, hydrogen, and ammonium are secreted in the
a. loop of Henle. c. glomerulus.
b. collecting duct. d. proximal tubule.
C
In addition to its major role in resorbing water and solutes from the filtrate, the proximal tubule secretes organic anions and cations into the tubular lumen. Ammonia is produced from the metabolism of glutamine in the mitochondria of the proximal tubule cells, where ammonia (NH3) combines with hydrogen (H+) to form ammonium (NH4+), which is secreted into the proximal tubule lumen.
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