Which stage of urine production involves adding ammonia, uric acid, and other waste substances directly into the renal tubule?
A) reabsorption
B) filtration
C) secretion
D) excretion
C) secretion
Secretion is when ammonia, uric acid, and other waste substances are secreted
directly into the renal tubule. Reabsorption is when water, nutrients, and electrolytes are returned
to the bloodstream. Filtration removes substances from the bloodstream. Excretion is not a stage
of urine production.
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