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