#Question id: 11941
#Unit 7. System Physiology – Animal
Under conditions of normal renal function, which of the following is true of the concentration of urea in tubular fluid at the end of the proximal tubule?
#Question id: 11942
#Unit 7. System Physiology – Animal
A patient’s urine is collected for 2 hr, and the total volume is 600 ml during this time. Her urine osmolarity is 150 mOsm/L, and her plasma osmolarity is 300 mOsm/L. What is her “free water clearance”?
#Question id: 11943
#Unit 7. System Physiology – Animal
Which of the following changes tends to increase GFR?
#Question id: 11944
#Unit 7. System Physiology – Animal
The maximum clearance rate possible for a substance that is totally cleared from the plasma is equal to which of the following?
#Question id: 11945
#Unit 7. System Physiology – Animal
A patient has the following laboratory values: arterial pH = 7.13, plasma HCO3− = 15 mEq/L, plasma chloride concentration = 118 mEq/L, arterial Pco2 = 28 mm Hg, and plasma Na+ concentration = 141 mEq/L. What is the most likely cause of his acidosis?
#Question id: 11946
#Unit 7. System Physiology – Animal
A 3-week-old infant is brought to the emergency room in a comatose condition. The history reveals that her parents have been feeding her concentrated, undiluted formula for 5 days. (Infant formula preparations are often sold in concentrated forms that must be properly diluted with water before feeding.) The infant’s plasma osmolality is 352 mOsm/L (normal is 280 to 300 mOsm/L), and the osmolality of the urine is 497 mOsm/L. What is the explanation for the hyperosmotic condition of the plasma?