How Can Urine Contain a Higher Concentration of Wastes (Be

question 21

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 in the loop of the nephron and collecting ducts leaves behind a 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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Definitions:

Ecological Perspective

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