Excretion is best defined as the removal of
Correct answer: D. metabolic waste products formed in the cells
- A. undigested food from the intestine
- B. excess water only
- C. dead cells from the skin surface
- D. metabolic waste products formed in the cells
Explanation
True excretion eliminates substances made by metabolism, such as urea and CO2. Undigested food never entered the cells, so its removal is egestion, a distinction examiners test regularly.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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