In the provided material, increased BUN is associated with which condition?

In the provided material, increased BUN is associated with which condition?

• A. Dehydration
• B. Kidney failure
• C. Starvation
• D. Liver disease

Answer: (C)

When the body is in a state of starvation, it turns to breaking down its own proteins for energy and glucose. This proteolysis releases nitrogen in the form of amino groups, which are deaminated to produce ammonia. The liver then converts ammonia to urea through the urea cycle, and the kidneys excrete this urea. The result is more urea being formed and cleared, which can show up as an elevated BUN. So, increased BUN in this context reflects increased nitrogen turnover from protein catabolism during starvation. Context for the other options: dehydration and kidney failure often raise BUN because of reduced kidney perfusion or excretion, while liver disease tends to lower BUN due to impaired urea synthesis. The material in this item links the rise in BUN specifically to the catabolic state of starvation.

When the body is in a state of starvation, it turns to breaking down its own proteins for energy and glucose. This proteolysis releases nitrogen in the form of amino groups, which are deaminated to produce ammonia. The liver then converts ammonia to urea through the urea cycle, and the kidneys excrete this urea. The result is more urea being formed and cleared, which can show up as an elevated BUN. So, increased BUN in this context reflects increased nitrogen turnover from protein catabolism during starvation.

Context for the other options: dehydration and kidney failure often raise BUN because of reduced kidney perfusion or excretion, while liver disease tends to lower BUN due to impaired urea synthesis. The material in this item links the rise in BUN specifically to the catabolic state of starvation.