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Bilirubin Metabolism Quiz

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Questions and Answers

What is the main function of the urea cycle?

Breakdown of amino acids for energy storage

Excretion of nitrogen in the form of urea (correct)

Regulation of carbohydrate metabolism

Synthesis of glutamine

How is excess nitrogen eliminated in the body?

By releasing it through respiration

By converting it to glycogen

Through the urea cycle (correct)

By synthesizing more amino acids

What happens to the concentration of urea-cycle enzymes with long-term changes in dietary protein?

It increases slightly

It remains constant

It can change by 20-fold or greater (correct)

It decreases gradually

In conditions of starvation, why do enzyme levels in the urea cycle rise?

Due to proteins being degraded for energy Signup and view all the answers

What is cirrhosis of the liver and where does it rank in causes of death for the 45–65 age group?

It is the third most common cause of death after heart disorders and cancer Signup and view all the answers

What are the most common causes of cirrhosis in the Western world?

Chronic alcoholism and hepatitis C Signup and view all the answers

What is the significance of glutamate dehydrogenase and glutamine synthetase in peripheral tissues?

They are important for removing reduced nitrogen Signup and view all the answers

How is reduced nitrogen primarily removed in the brain?

By glutamate dehydrogenase and glutamine synthetase Signup and view all the answers

What does the statement 'The urea cycle operates only to eliminate excess nitrogen' imply?

Urea cycle functions to maintain nitrogen balance Signup and view all the answers

How do urea-cycle enzymes respond to changes in dietary protein levels?

Enzyme levels can change significantly based on protein intake Signup and view all the answers