How Can Urine Contain a Higher Concentration of Wastes (Be

question 57

Multiple Choice

How can urine contain a higher concentration of wastes (be hypertonic) than the blood?

• A)Urine cannot since the process is passive diffusion
• B)Reabsorption of water and salt in the loop of the nephron and collecting ducts leaves behind more concentrated urine
• C)All stages in the kidney involve active transport
• D)Urine can be hypertonic for small molecules if it is hypotonic for an equal number of big molecules
• E)The whole nephron is impermeable to water

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