Quick Answer: Where Do The Vasa Recta Drain?

Why is counter current flow more efficient in dialysis?

Countercurrent flow maximizes the concentration gradient between blood and dialysate throughout the length of the dialyzer (see Box 22.1).

When blood flow and dialysate flow are in the same direction (cocurrent), small solute clearance decreases by about 10%..

Is Vasa recta present in cortical nephron?

The superficial cortical nephrons have peritubular capillaries which branch off the efferent arterioles, and provide nutrients to the epithelial cells which are present there. … The juxtamedullary nephrons have a special structure within the peritubular capillaries, called the vasa recta.

What is the role of vasa recta in the concentration of urine?

Vasa Recta Function The vasa recta, the capillary networks that supply blood to the medulla, are highly permeable to solute and water. … As a result, the medullary interstitial osmotic gradient cannot be maintained, which also reduces the ability to concentrate the urine.

What happens to blood as it passes through the peritubular capillaries or the Vasa recta?

Peritubular capillaries surround the cortical parts of the proximal and distal tubules, while the vasa recta go into the medulla to approach the loop of Henle. … The higher osmolarity of the blood in the peritubular capillaries creates an osmotic pressure which causes the uptake of water.

What is the difference between the peritubular capillaries and the Vasa recta?

The main difference between vasa recta and peritubular capillaries is that the vasa recta are the blood capillaries that surround the loop of Henle in the juxtamedullary nephrons. But, peritubular capillaries are the blood capillaries that surround the PCT and DCT of the cortical nephrons.

Where are Vasa recta found?

In the blood supply of the kidney, the vasa recta renis (or straight arteries of kidney, or straight arterioles of kidney) form a series of straight capillaries in the medulla. They lie parallel to the loop of Henle.

What does the Vasa recta contain?

The vasa recta of the kidney, (vasa rectae renis) are the straight arterioles, and the straight venules of the kidney, – a series of blood vessels in the blood supply of the kidney that enter the medulla as the straight arterioles, and leave the medulla to ascend to the cortex as the straight venules.

Which substances are not filtered through the kidneys?

Filterable blood components include water, nitrogenous waste, and nutrients that will be transferred into the glomerulus to form the glomerular filtrate. Non-filterable blood components include blood cells, albumins, and platelets, that will leave the glomerulus through the efferent arteriole.

What is the function of the Vasa recta quizlet?

What is the function of the vasa recta? It maintains the concentration gradient established by the loop of Henle.

What happens in Vasa recta?

The vasa recta capillaries are long, hairpin-shaped blood vessels that run parallel to the loops of Henle. The hairpin turns slow the rate of blood flow, which helps maintain the osmotic gradient required for water reabsorption. Illustration of the vasa recta which run alongside nephrons.

Why is Vasa recta absent in cortical nephron?

The proximity between the Henle’s loop and vasa recta, as well as the counter current in them help in maintaining an increasing osmolarity towards the inner medullary interstitium. This gradient is mainly caused by NaCl and urea. … This mechanism helps to maintain a concentration gradient in the medullary interstitium.

What does Vasa recta mean?

Medical Definition of vasa recta 1 : numerous small vessels that arise from the terminal branches of arteries supplying the intestine, encircle the intestine, and divide into more branches between its layers.

Does the distal convoluted tubule reabsorb water?

The distal convoluted tubule and collecting ducts are then largely responsible for reabsorbing water as required to produce urine at a concentration that maintains body fluid homeostasis.

Where is urine most concentrated?

Maximum concentration occurs at the bottom of the loop. The ascending limb of the nephron loop is impermeable to water, but Na + and Cl – are pumped out into the surrounding fluids by active transport. As fluid travels up the ascending limb, it becomes less and less concentrated because Na + and Cl – are pumped out.

Where do the peritubular capillaries drain into?

As discussed previously, in the juxtamedullary nephrons, the peritubular capillaries form the ascending and descending vasa recta. The peritubular capillaries and vasa recta then drain into the interlobular vein, which unites with others to form the arcuate vein.