order to reduce the amount of filtrate getting to the proximal tubule where most
ID: 3514889 • Letter: O
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order to reduce the amount of filtrate getting to the proximal tubule where most sodium is reabsorbed? QUESTION 4 A 40 yom complained of polyuria, nocturia and polydypsis. He was found to produce approximately 7 L of urine per day. When 0.25 ml/kg of a 2.5% Nacl solution was infused intravenously for 45 minutes, the specific gravity of his urine increased from 1.001 to 1.003 urine osmolality increased from 3 to 6 mOsm/kg of water). A medication was administered that caused a marked reduction in urine volume for approximately 12 hours. The specific gravity of the urine rose to 1.025 (960 mOsm/kg of water) during this time. 1. Is this patient's problem caused by a renal or extrarenal lesion? 2. What is a primary determinant of the specific gravity of the urine? 3. What are the units of osmolality 4. What membrane protein is responsible for water movement across the epithelial cells of the collecting duct? 5. What was the medicine administered? Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All AnswersExplanation / Answer
1. External lesion
2. Dissolved solutes in urine
3. Osm/kg
4. Aquaporin
5. Vasopressin (also called antidiuretic hormone or ADH)
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