The lower portion of the _______ is permeable to urea, which diffuses into the interstitial fluid of the medulla.

Name: The lower portion of the _______ is permeable to urea, which diffuses into the interstitial fluid of the medulla.
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The lower portion of the collecting duct is permeable to urea, allowing it to diffuse into the interstitial fluid of the medulla. This process plays a key role in the concentration of urine and the regulation of water and electrolyte balance in the body.

The Lower Portion of the _______ Is Permeable to Urea