The descending limb of the loop of Henle is permeable to ........ .

Urine is concentrated in which part of the nephron?

The vasa recta are tubular capillaries around the ........

The function of the loop of Henle is:

Given below are two statements with respect to counter current mechanism.
$Statement-I$: Tissue fluid around the descending limb of Henle's loop becomes concentrated, during the counter current mechanism.
$Statement-II$: Water moves out from the descending limb of Henle's loop into the tissue fluid by osmosis.
In the light of the above statements, select the correct option from the codes given below:

Which ions enter the vasa recta?