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Questions and Answers
What is the primary factor that influences the concentration of urea in the body water?
What is the primary factor that influences the concentration of urea in the body water?
- The rate of blood circulation in the body
- The rate of production by the liver (correct)
- The rate of removal by the kidney
- The rate of digestion in the stomach
During which stage of pregnancy can a low urea level occur normally?
During which stage of pregnancy can a low urea level occur normally?
- First trimester
- After childbirth
- During menopause
- Second or third trimester (correct)
Which organ is responsible for removing urea from the body water?
Which organ is responsible for removing urea from the body water?
- Liver
- Kidney (correct)
- Heart
- Lungs
What is the relationship between the rate of production by the liver and the rate of removal by the kidney in determining the concentration of urea in the body water?
What is the relationship between the rate of production by the liver and the rate of removal by the kidney in determining the concentration of urea in the body water?
What would be the effect on urea concentration in the body water if the liver's production rate increases?
What would be the effect on urea concentration in the body water if the liver's production rate increases?
What is the primary purpose of a urea test?
What is the primary purpose of a urea test?
What happens to urea levels in the blood if kidneys are not functioning normally?
What happens to urea levels in the blood if kidneys are not functioning normally?
What is the significance of a high urea level in the blood?
What is the significance of a high urea level in the blood?
What is the relationship between kidney function and urea levels?
What is the relationship between kidney function and urea levels?
What is the primary role of the kidneys in relation to urea?
What is the primary role of the kidneys in relation to urea?
What is the primary function of the catabolic pathway mentioned in the passage?
What is the primary function of the catabolic pathway mentioned in the passage?
In which unit is the blood urea test result measured in the United States?
In which unit is the blood urea test result measured in the United States?
What is the purpose of the blood urea test?
What is the purpose of the blood urea test?
What is the international unit of measurement for the blood urea test result?
What is the international unit of measurement for the blood urea test result?
What is the primary goal of the catabolic pathway mentioned in the passage?
What is the primary goal of the catabolic pathway mentioned in the passage?
What is the primary reason for performing a urea test?
What is the primary reason for performing a urea test?
What happens to the level of urea in the blood when the kidneys are not functioning properly?
What happens to the level of urea in the blood when the kidneys are not functioning properly?
Which of the following can lead to an increase in urea levels in the blood?
Which of the following can lead to an increase in urea levels in the blood?
What is the primary organ responsible for converting ammonia into urea?
What is the primary organ responsible for converting ammonia into urea?
What is the final product of protein and amino acid metabolism?
What is the final product of protein and amino acid metabolism?
What can cause a decrease in urea levels in the blood?
What can cause a decrease in urea levels in the blood?
What is the primary mechanism by which the body removes excess nitrogen from the blood?
What is the primary mechanism by which the body removes excess nitrogen from the blood?
What is the process by which proteins are broken down into amino acids?
What is the process by which proteins are broken down into amino acids?
What is the normal range of urea in the blood?
What is the normal range of urea in the blood?
Which of the following conditions can cause high urea counts?
Which of the following conditions can cause high urea counts?
What is a possible consequence of gastrointestinal bleeding?
What is a possible consequence of gastrointestinal bleeding?
Why does severe liver failure cause a reduction of urea in the blood?
Why does severe liver failure cause a reduction of urea in the blood?
What is a possible cause of low urea counts?
What is a possible cause of low urea counts?
What can result in overhydration, leading to low urea counts?
What can result in overhydration, leading to low urea counts?
Which of the following medications can cause high urea counts?
Which of the following medications can cause high urea counts?
What is a possible consequence of a high protein diet?
What is a possible consequence of a high protein diet?
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Study Notes
Urea and Kidney Function
- A urea test is done to check if kidneys are working properly, and a high urea level indicates kidney malfunction.
- Urea level can rise if kidneys are not removing urea from the blood normally.
Urea Production and Removal
- The concentration of urea in the body water depends on the rate of production by the liver and the rate of removal by the kidneys.
- The liver produces urea as a final degradation product of protein and amino acid metabolism.
Normal Urea Level
- A normal urea level is between 7 to 20 mg/dL (2.5 to 7.1 mmol/L) in the blood.
Causes of High Urea Counts
- Urinary tract obstruction
- Congestive heart failure or recent heart attack
- Gastrointestinal bleeding
- Dehydration
- Certain medications (e.g., corticosteroids and some antibiotics)
- A high protein diet
Causes of Low Urea Counts
- Liver failure
- Malnutrition
- Anabolic steroid use
- Overhydration (e.g., from prolonged intravenous fluids)
- Impaired nutrient absorption
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