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Loop of Henle

Loop of Hens
The loop of Henle is a U-shaped tube in the middle of the nephron and mainly involved in water and salt absorption. It consists of a descending limb, which is permeable to water. This permeability is what leads to an in increase medulla tissue osmolarity as filtrate travels down the descending limb, where water is extracted from the loop. Water follows increasing salt gradients osmotically, moving out of the loop of Henle into surrounding renal cells. The vasa recta are a series of capillaries that maintain the salt concentration gradient, despite the continuous absorption of water and salts. In the ascending limb of the loop of Henle, sodium is reabsorbed through active transport, which uses ATP to bring sodium into the tissue. The filtrate becomes less concentrated in the ascending loop because of the large amount of salt reabsorbed into renal cells out of the loop of Henle. In addition to this, the ascending loop because it is impermeable to water, which also aids in making the filtrate less concentrated. The ascending limb leads to the distal tubule, which is the last major site of absorption in the nephron.
Descending Limb
Down-arrow into tube

The descending limb is the part of the loop of Henle where filtrate travels from renal cortex tissue to renal medulla tissue. This part of the loop of Henle is very water permeable.

Water Follows Na+
Water-bottle Follows Salt-shaker

Water flows out of the descending limb, as there is an osmotic gradient created from a higher sodium concentration in the renal tissues, outside of the loop.

Medullary Hypertonicity
Medusa and Hiker-tonic

The salt concentration of the medulla increases as filtrate travels down the loop. As water travels out of the descending limb, other ions in the filtrate remain, causing medullary hypertonicity to develop.

Increased Water Reabsorption
Up-arrow Water

Water is absorbed from the descending loop of Henle into the surrounding renal tissues, helping to increase the loop of Henle’s medullary salt concentration.

Vasa Recta
Vase Erector-set

The vasa recta is a term describing a series of capillaries that maintain the concentration gradient of renal tissue. These capillaries do so by transporting the sodium absorbed from the ascending limb around to the descending limb.

Na+ Reabsorbed Via Active Transport
Salt on ATP conveyor-belt

Sodium is reabsorbed into renal tissues in the ascending loop of Henle via active transport, in a process requiring ATP use.

Ascending Limb
Up-arrow Tube

The ascending limb of the loop of Henle has filtrate traveling towards the renal cortex tissue. It is more permeable to salts than the descending limb, and it is impermeable to water.

Reabsorbs Na+, K+, Cl-
Salt-shaker, Banana and Chlorine-dispenser

Na+, K+ and Cl- are actively reabsorbed by the Na+/K+/2Cl- cotransporter into the renal cells surrounding the loop of henle.

Decreased Concentration of Filtrate
Filtrate fluid turns from Dark yellow to Light yellow

The filtrate becomes less concentrated as it exits the loop of Henle because Na+, K+ and Cl- are actively reabsorbed into surrounding renal cells. Additionally, the ascending loop is impermeable to water, thus the filtrate becomes less concentrated.

Impermeable to Water

The ascending limb of the loop of Henle is impermeable to water, gradually making the filtrate less concentrated as it travels up the loop. This is because salts are transported out of the ascending limb, but water stays.

Distal Tubule
Disco-ball Tube

The loop of Henle exits to the distal tubule, which is the last major site of absorption in the nephron.

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