Answer:
There are various substances released by descending and ascending loop of henle like water and ions.
Step-by-step explanation:
The descending loop of henle is impermeable or less permeable to ions and urea but permeable to water. Therefore only water is reabsorbed from descending loop of henle by passive transport.
The ascending loop is impermeable to water but permeable to ions like Na⁺,k⁺ and Cl⁻. So only the reabsorption of these ions takes place in this loop by active transport.
Apart from ions permeability ascending loop is also permeable to urea and is involved in secretion of urea.