Answer: Carbon dioxide.
- A Oxygen gas
- B Glucose sugar
- C Carbon dioxide
- D Lactic acid
Correct answer: C. Carbon dioxide
Explanation: In the liver's ornithine (urea) cycle, ammonia is combined with carbon dioxide to make the less toxic urea.
Filtrate flows through four functionally distinct stages of the nephron: Bowman's capsule filters blood, the PCT reabsorbs most useful substances unconditionally, the Loop of Henle builds a concentration gradient via counter-current exchange, the DCT secretes selected substances, and the collecting duct performs the final ADH-controlled water reabsorption.
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
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