Explain the mechanism of formation of co...

Explain the mechanism of formation of concentrated urine in mammals.

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The normal human urine is about four times as concentrated as plasma of blood. This ability of concentrating the urine is a main adaptation for conservation of water and is regulated by two counter current mechanisms :
(1) Counter current mechanism in Vasa rectae:
(ii) Counter current mechanism in Loop of Henle:

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Mechanism of formation of A and B is

`A_(AC^(2))`

`A_(AC^(1))`

`A_(AL^(1))`

`A_(AL^(2))`

Mechanism of formation of A and B is :

`A_(AC^(2))`

`A_(AC^(1))`

`A_(AL^(1))`

`A_(AL_(2))`

Which hormone cause formation of concentrated urine during water scarcity?

ADH

Adrenaline

Thyroxine

Oxytocin