The metabolic waste of a mammal includes all the following except:
Correct answer: D. Undigested food
- A. CO2
- B. Water
- C. Urea
- D. Undigested food
Explanation
The correct answer is 'Undigested food'. Metabolic waste refers to substances produced as a byproduct of metabolic processes within cells. CO2, water, and urea are all products of metabolism. CO2 is produced during cellular respiration, water is generated in various metabolic reactions, and urea is formed in the liver from ammonia. Undigested food, on the other hand, is not a product of metabolism; it is simply food that has not been absorbed by the digestive system and is expelled from the body as feces.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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