There can be more than 1 right answer. Is it B and C both? I know...

There can be more than 1 right answer. Is it B and C both? I know it happens by diffusion and it says passive transport. But proteins are required too? or does it just work with diffusion.

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

A. active transport

B. simple diffusion

C. facilitated diffusion

D. endocytosis

Expert Solution

Option C-Facilitated diffusion is the correct answer.

The medullary collecting duct is Permiable to water only in the presences of Anti diuretic hormone(Vasopressin)

In the absence of Anti diuretic Hormone,The collecting duct is impermiable to water

That is , the reabsorption of water in The collecting duct occur by the action of anti-diuretic hormone (ADH) & aquaporins

Antidiuretic Hormone---------------Increases the number of aquaporin 2 channels in the cells present in the apical membrane of collecting duct. Water is reabsorbed with the help of Aquaporins

Aquaporins are integral membrane proteins that helps reabsorption of water by acting like water channels

So this is a Type of facilitated diffusion-That is diffusion that occur with the help of some specific transmembrane integral proteins. (Here-Aquaporins)

Simple diffusion means diffusion of substances without the help of any other substances like proteinSince here Aquaporins are needed for the reabsorption of Water molecules,this is a type of facilitated diffusion

Sydney Mullin answered 1 year ago

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