题目
W25 BIOL D006A 02Y Form/Funct In The Biolgcl Wrld BIOL-6A_Exam 2 - Winter 2025
匹配题
Match the substance with its normal healthy human excretion (clearance) rate. 1: urea 2: protein 3: water 4: sodium ions 5: glucose
选项
A.filtered, but 100% reabsorbed
B.not filtered nor excreted
C.filtered, but 99–99.8% reabsorbed
D.filtered, but 98–100% reabsorbed
E.filtered, but small % reabsorbed
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标准答案
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思路分析
We’re asked to match each substance with its normal, healthy excretion (clearance) rate in the kidneys. The question provides five substances and five possible excretion descriptors. I’ll evaluate each option and then assign the most plausible matches.
Option A: about the descriptor 'filtered, but 100% reabsorbed'. This would imply complete reabsorption of the filtered substance, leaving essentially no excretion. In physiology, glucose is normally completely reabsorbed in the proximal tubule up to the transport maximum, but in normal conditions there is indeed near 100% reabsorption; however, if we interpret this descriptor as applying to the substance, it would more accurately describe glucose (A later match). For many other substances, 100% reabsorption does not occur, so this descriptor is generally too absolute for broad use and will be reserved for a substance like glucose when matched specifically.
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