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- Apr 25, 2011
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(Passage not needed to answer the question.)
A lower than normal blood pressure will cause which of the following effects on the rate of plasma clearance of Substance A?
A) An increase, because the concentration of Substance A in the urine will increase
B) An increase, because the ADH levels will be very low
C) A decrease, because the decreased rate of urine output will allow more reabsorption by the kidney
D) A decrease, because ADH levels will be very high
So the answer is C but I chose D. The answer says that there is not enough information in the passage to go with D -- HOWEVER, it does state: "The effect of ADH on the plasma clearance was tested. The volunteer was given two dosages of aDH during separate trials. The first dosage was within the normal physiological range of concentrations and affected the renal concentration of water. The second dosage, which was much higher than the normal physiological concentration, affected urine output by increasing blood pressure."
Even if the tester doesn't know the effect of ADH (which we obviously should) on BP, there's enough info in the passage to ascertain this. Meanwhile C seems kinda shaky since the decreased rate of urine output is an EFFECT of decreased reabsorption by the kidney... not the other way around.
What gives?!?!
A lower than normal blood pressure will cause which of the following effects on the rate of plasma clearance of Substance A?
A) An increase, because the concentration of Substance A in the urine will increase
B) An increase, because the ADH levels will be very low
C) A decrease, because the decreased rate of urine output will allow more reabsorption by the kidney
D) A decrease, because ADH levels will be very high
So the answer is C but I chose D. The answer says that there is not enough information in the passage to go with D -- HOWEVER, it does state: "The effect of ADH on the plasma clearance was tested. The volunteer was given two dosages of aDH during separate trials. The first dosage was within the normal physiological range of concentrations and affected the renal concentration of water. The second dosage, which was much higher than the normal physiological concentration, affected urine output by increasing blood pressure."
Even if the tester doesn't know the effect of ADH (which we obviously should) on BP, there's enough info in the passage to ascertain this. Meanwhile C seems kinda shaky since the decreased rate of urine output is an EFFECT of decreased reabsorption by the kidney... not the other way around.
What gives?!?!