To evaluate kidney function in a 45-year-old woman with type II diabetes, you ask her to collect her urine over 24 hours. She collects 3600 ml of urine in that period. The clinical laboratory returns the following results after analyzing the patient’s urine and plasma samples: plasma creatinine = 4 mg/dL, urine creatinine = 32 mg/dL, plasma potassium = 5 mmol/L, and urine potassium = 10 mmol/L.

What is the net renal tubular reabsorption rate of potassium in this patient?

#Question id: 11040

#Unit 7. System Physiology – Animal

An increase in which of the following would be expected to decrease blood flow in a vessel?

#Question id: 11039

#Unit 7. System Physiology – Animal

Which blood vessel has the highest vascular resistance?

#Question id: 11038

#Unit 7. System Physiology – Animal

Which of the following substances in plasma is the major factor that contributes to plasma colloid osmotic pressure?

#Question id: 11037

#Unit 7. System Physiology – Animal

A 22-year-old man has a muscle blood flow of 250 ml/min and a hematocrit of 50. He has a mean arterial pressure of 130 mm Hg, a muscle venous pressure of 5 mm Hg, and a heart rate of 80 beats/min. Which of the following is the approximate vascular resistance in the muscle of this man?

#Question id: 11036

#Unit 7. System Physiology – Animal

Under control conditions, flow through a blood vessel is 100 ml/min under a pressure gradient of 50 mm Hg. What would be the approximate flow through the vessel after increasing the vessel diameter to four times normal, assuming that the pressure gradient was maintained at 50 mm Hg?

#Question id: 11035

#Unit 7. System Physiology – Animal

A 72-year-old man had surgery to remove an abdominal tumor. Pathohistologic studies reveal that the tumor mass contains a large number of blood vessels. An increase in which of the following is the most likely stimulus for the growth of vessels in a solid tumor?