Kidney

MCAT_Retaker
Posts: 77
Joined: Thu Feb 01, 2018 3:58 am

Kidney

Postby MCAT_Retaker » Fri Jun 15, 2018 1:09 am

I thought both ADH and Aldosterone can act on collectign duct
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MCAT_Retaker
Posts: 77
Joined: Thu Feb 01, 2018 3:58 am

Re: Kidney

Postby MCAT_Retaker » Fri Jun 15, 2018 1:54 am

should be descending
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NS_Tutor_Alex
Posts: 8
Joined: Fri Jul 21, 2017 4:11 pm

Re: Kidney

Postby NS_Tutor_Alex » Fri Jun 15, 2018 8:09 pm

Hi MCAT_Retaker,

Aldosterone works on both the distal convoluted tubule as well as the collecting duct. ADH/Vasopressin works on the collecting duct. The difference here is that Aldosterone works by increasing the reabsorption of Na+ ions, causing water to also be reabsorbed. ADH/Vasopressin works by inserting aquaporins into the collecting duct epithelial cells.

Regarding your second question, the descending loop of Henle will allow passive flow of H2O into the medulla. It is the ascending loop of Henle that will use active transport to reabsorb ions.

Hope that helps!

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