About 180 liters of blood plasma is filtered into human nephrons per day and, of that amount, about 2-3 liters leaves the body as urine. Therefore, the percentage of plasma filtrate that leaves as urine each day is about _______.
A. 10-20 percent
B. 20-50 percent
C. 0.1-0.2 percent
D. 1-2 percent
E. 5-10 percent
F. 0.5-1.0 percent
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about filtrate? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
D. 1-2 percent
Clarify Question
What is the key concept addressed by the question?
· This question is asking about the efficiency of the kidneys.
What type of thinking is required?
· Analyze level:
o This question is asking you to identify the percentage of filtrate out of the total blood plasma that is filtered that is released as urine per day.
Gather Content
What do you already know about filtrate? What other information is related to the question?
· Human kidneys produce urine that is much more concentrated than blood plasma.
· Concentration of urine occurs in the nephrons as water is reabsorbed.
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
· Solving this question is accomplished by dividing the urine volume that forms by the volume of the blood plasma that is filtered, and multiplying that number by 100 to obtain a percent value.
· 2/180 =0.011 (100) = 1.1%
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
· Analyze level:
o Answering this question correctly depended your ability to recognize that the amount of urine that is formed can be expressed as a percent of the total plasma filtered. If you got an incorrect answer, did you remember that components of the urine formed in this case was 2-3 liters, and the amount of plasma that was filtered was 180 liters? Did you have trouble breaking down the amount of filtrate that becomes urine to determine the correct answer?
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