Carbon dioxide, the waste product of respiration, is excreted mainly by the
Correct answer: A. lungs
- A. lungs
- B. kidneys
- C. liver
- D. skin
Explanation
CO2 diffuses into the alveoli and is breathed out, so the lungs are the principal organ of its removal. The kidneys handle nitrogenous wastes instead, dividing excretory labour between the two systems.
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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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