Answer to Question #154527 in Human Anatomy and Physiology for usman

Question

how and when is concentrated urine is formed in human body

Answer 1

When the fluid entering the ducts i.e heading to the renal pelvis, acquires the concentration of the interstitial fluid of the medulla.

The renal medulla produces concentrated urine through the generation of an osmotic gradient extending from the cortico-medullary boundary to the inner medullary tip.