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There can be more than one right answer. I think the answer can be B and...

There can be more than one right answer. I think the answer can be B and C both. Do you think is it only one of those or both?

17. Reabsorption of H2O in the medullary collecting ducts is by

A. active transport B. simple diffusion C. facilitated diffusion D. endocytosis

Science   Anatomy-And-Physiology   
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Answer #1

The correct answer would be (C)facilitated diffusion.
Resorption in the collecting ducts occurs in the presence of the aquaporins. So the diffusion occurs with help of aquaporin type 2 protein. Hence it is facilitated diffusion only.

How does this happen?

  • In the collecting ducts, ADH ( anti diuretic hormone) influences the osmolality of the tubular fluid. ADH increases the permeability of tubular epithelial cells to water by increasing the pore size with the help of Aquaporin-2 protein.
  • Resorption of water in the collecting duct under the influence of ADH is called facultative reabsorption of water, which varies depending upon the need of the body .
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