Which stage of urine production involves the removal of substances from the bloodstream?
A) reabsorption
B) excretion
C) filtration
D) secretion
C
Explanation: 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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