Practice Test FEBRUARY 2007: Test 2 Flashcards
If plasma osmolality is 300 mOsm, what is the best estimate of filtrate osmolality in the urinary space?
300 mOsm
All reabsorptive and secretory processes in the nephron are ultimately attributable to the activity of _________?
Basolateral Na+K+ ATPase
Each of the following undergoes a decrease in filtrate concentration as filtrate flows through the proximal tubule EXCEPT:
a. protein
b. glucose
c. HCO3-
d. urea
e. phosphate
d. Urea does not undergo a decrease in concentration through the proximal tubule
- Protein, glucose, HCO3-, and phosphate all decrease in concentration through the proximal tubule
Plasma [creatinine] is 0.7 mg/dL. The excretion rate of creatinine is 8 mg/min. The GFR is 10 dL/min. At what rate is creatinine secreted?
1 mg/min
Why is iohexol clearance preferred over creatinine clearance as a kidney function test?
Because urine is not collected in the iohexol test
What is a common clinical finding in an animal with renal amyloidosis?
Pronounced proteinuria
Each is synthesized in the kidney EXCEPT:
a. urea
b. calcitriol
c. erythropoeitin
d. renin
e. glucose
a. Urea is not made in the kidney.
- Calcitriol, Erythropoeitin, Renin, and Glucose CAN all be synthesized in the kidney
An animal has just experienced a decrease in normal blood pressure. What is the renal autoregulatory response to this decrease?
DILATION of AA. and CONSTRICTION of EA
Renal plasma flow in a normal kidney is 200 ml/min. What is the best estimate for plasma flow leaving the efferent arterioles and entering peritubular capillaries?
135 ml/min
Over what period of time is the entire plasma volume of an animal filtered?
30 minutes
What is found ONLY in the proximal tubule?
Na+Phosphate Symport
What best characterizes the urine of an animal with diabetes insipidus?
High flow and (+) free water clearance
The nephron is net secretory for K+ where?
DCT and CCD only
The nephron is net reabsorptive where?
PCT, LOH, DCT and CCD
If plasma [Na+] in the renal artery is 140 mOsm, what is the best estimate of of plasma [Na+] in the renal vein?
140 mOsm