In cats, dietary arginine deficiency results in a metabolic adaptation that causes:

Question

BlackTom AI · Accepted Answer

When evaluating the effects of dietary arginine deficiency in cats, we need to consider the role of arginine in the urea cycle and ammonia detoxification.
Option 1: 'Increased blood NH3 (ammonia) concentrations' correctly reflects what happens when arginine is deficient. Arginine is essential for the urea cycle, and its shortage impairs conversion of ammonia into urea, leading to hyperammonemia and elevated blood ammonia levels.
Option 2: 'Reduced blood NH3 (ammonia) concentrations' would be the opposite of what occurs. Since the urea cycle is hampered without arginine, ammonia cannot be efficiently detoxified, so ammonia rises rather than falls.
Option 3: 'Excess ornithine production' is unlikely in arginine deficiency. In the urea cycle, ornithine is a substrate that participates in the cycle; a lack of arginine does not drive excess ornithine production. In fact, disruptions typically lead to impaired flux through the cycle, not surplus ornithine.
Option 4: 'An inability to conjugate bile acids' relates to hepatic bile acid conjugation, which depends on different pathways (including glycine/taurine conjugation) and not directly on arginine availability in the urea cycle. Arginine deficiency primarily disrupts ammonia detoxification, not bile acid conjugation capability.
Overall, the central mechanism is that insufficient arginine blocks the urea cycle's ability to convert ammonia to urea, causing hyperammonemia, which aligns with option 1.

In cats, dietary arginine deficiency results in a metabolic adaptation that causes:单项选择题

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