AP BIOLOGY

Detailed explanation-1: -The kidney is divided into two parts: the outer cortex and the inner medulla. In the cortex, the osmolarity is relatively low (think less salty), around 300 mOsm/L or so, but as you travel further down into the medulla, the osmolarity gets much higher (think more salty).

Detailed explanation-2: -The mature renal medulla, the inner part of the kidney, consists of the medullary collecting ducts, loops of Henle, vasa recta and the interstitium. The unique spatial arrangement of these components is essential for the regulation of urine concentration and other specialized kidney functions.

Detailed explanation-3: -The renal medulla is the interior portion of the kidney where the primary functions of the organ occur: the filtering of waste materials and elimination of fluid from the body. The kidney filters blood and sends waste materials to the bladder to become excreted urine.