Why Are Birds Able to Concentrate Their Urine Hyperosmotic to Their

question 15

Multiple Choice

Why are birds able to concentrate their urine hyperosmotic to their blood plasma?

• A) Their kidneys have loops of Henle.
• B) They excrete uric acid.
• C) They have an exceptional ability to excrete Na⁺.
• D) They have loopless nephrons.

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