the thin ascending limb of the loop of henle is impermeable to water.
the ____ limb of the loop of henle is impermeable to water?
thin ascending
bullet::::- loop of henle (hair-pin like, i.e. u-shaped, and lies in medulla)









































bullet::::- descending limb of loop of henle









































bullet::::- ascending limb of loop of henle









































bullet::::- the ascending limb of loop of henle is divided into 2 segments: lower end of ascending limb is very thin and is lined by simple squamous epithelium. the distal portion of ascending limb is thick and is lined by simple cuboidal epithelium.









































bullet::::- thin ascending limb of loop of henle









































bullet::::- thick ascending limb of loop of henle (enters cortex and becomes - distal convoluted tubule.)









































bullet::::- distal convoluted tubule









































bullet::::- connecting tubule
nephron
descending limb of loop of henle









































within the nephron of the kidney, the descending limb of loop of henle is the portion of the renal tubule constituting the first part of the loop of henle.









































section::::physiology.









































the permeability is as follows:









































also, the medullary interstitium is highly concentrated (because of the activity of the ascending limb), leading to a strong osmotic gradient from the descending limb to the medulla.









































because of these factors, the concentration of the urine increases dramatically in the descending limb. osmolality can reach up to 1400 mosmol/kg by the end of the descending limb.









































section::::histology.
descending limb of loop of henle