What is secreted in the descending loop of Henle?
The loop of Henle has a thin descending limb, a thick ascending limb and a thin ascending limb. The fluid entering the descending limb contains sodium chloride and other salts, urea and other chemicals that have been filtered out from the blood.
What happens in descending loop of Henle?
The descending limb of the loop of Henle is permeable to water. Water diffuses into the hyperosmolar medullary interstitium. NaCl is pumped from the tubule into the interstitium in the ascending limb. The tubular osmolarity decreases and fluid that leaves the loop is hypotonic.
Does the loop of Henle secrete anything?
Loop of Henle, long U-shaped portion of the tubule that conducts urine within each nephron of the kidney of reptiles, birds, and mammals. This function allows production of urine that is far more concentrated than blood, limiting the amount of water needed as intake for survival.
Where does most tubular secretion occur?
In humans, and other vertebrates, tubular secretion occurs in the kidneys, where the blood is filtered in specialized structures known as nephrons. These structures consist of a long tubule surrounded by extensive capillaries.
Why is water leaving the thin descending loop?
In summary, the loop of Henle is surrounded by tissue fluid which has a high concentration of ions in it. This causes water to move out of the descending limb by osmosis. Because of this concentration gradient ions move into the loop in the thin ascending limb.
What is the difference between ascending and descending loop of Henle?
The key difference between ascending and descending loop of Henle is that ascending loop of Henle is the thicker segment of the loop of Henle located just after the sharp bend of the loop while descending loop of Henle is the thinner segment located just before the sharp bend of the loop.
Does loop of Henle have brush border?
The thick descending limbs of the loop of Henle look similar to the proximal tubule, with apical brush borders. The thick ascending limbs are composed of cuboidal cells, but unlike the proximal convoluted tubule, they do not have apical brush borders.