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Very generally, excretion is the removal of substance from the body (micturition or defecation are good examples). Tubular excretion is probably referring to excretion of (filtrate, now urine) from the collecting duct of a nephron. Beyond the collecting duct, almost no secretion or absorption occurs, hence all substrate is excreted (NOT the same as secreted).

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13y ago
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5mo ago

Tubular excretion is the process by which the renal tubules of the kidneys actively pump waste products and excess substances from the blood into the urine for elimination from the body. It helps regulate the body's levels of certain substances, such as drugs, urea, and creatinine, by removing them from the bloodstream and excreting them in the urine.

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Q: What is tubular excretion?
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