The elimination of toxic nitrogenous waste and excess water in man is by______?
Correct answer: A. Excretion
- A. Excretion
- B. Circulation
- C. Reproduction
- D. Pollution
Explanation
Excretion removes metabolic wastes such as urea and also eliminates excess water and salts from the body, mainly through the kidneys. Circulation transports materials but does not remove them, and reproduction and pollution are unrelated processes. Students may choose circulation because blood carries wastes to the kidneys, but transport is not the same as elimination.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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