Where does countercurrent exchange occur in kidney?
renal medulla
It is generally accepted that the microcirculation of the renal medulla functions as a countercurrent exchanger that traps NaCl and urea deposited to the interstitium by the loops of Henle and collecting ducts, respectively.
What is the vasa recta of the kidney?
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 part of nephron supports counter current mechanism?
The counter current mechanism takes place in Juxtamedullary nephron. The function of the countercurrent multiplier is to produce the hyperosmotic Medullary Interstitium. The ADH promotes water reabsorption through the walls of the distal convoluted tubule and collecting duct.
In which of the constitute the countercurrent exchange system?
Countercurrent exchange circuits or loops are found extensively in nature, specifically in biologic systems. In vertebrates, they are called a rete mirabile, originally the name of an organ in fish gills for absorbing oxygen from the water. It is mimicked in industrial systems.
What is countercurrent exchange in vasa recta?
The vasa recta functions as a countercurrent exchanger In addition to a slow rate of blood flow, its architecture is such that it functions as a countercurrent exchanger because the vessels that run down to the medullary tip (descending limbs) bend back and travel upward (ascending limbs).
What is the role of the vasa recta as the countercurrent exchanger?
3) In the vasa recta surrounding the ascending limb, the reverse occurs because the plasma is now hypertonic to the medullary interstitium. This results in absorption of water into the blood and return of the absorbed solute to the interstitium. This is referred to as the countercurrent exchange mechanism.
How does vasa recta in the kidney help in counter current exchange and concentration of urine?
What is vasa recta explain its role in counter current mechanism?
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.
What is counter current mechanism in kidney?
The counter-current multiplier or the countercurrent mechanism is used to concentrate urine in the kidneys by the nephrons of the human excretory system. The nephrons involved in the formation of concentrated urine extend all the way from the cortex of the kidney to the medulla and are accompanied by vasa recta.
What is the role of counter current mechanism in kidney?
How does countercurrent exchange work in the vasa recta?
What is the countercurrent exchange mechanism in the vasa recta?
3) In the vasa recta surrounding the ascending limb, the reverse occurs because the plasma is now hypertonic to the medullary interstitium. This results in absorption of water into the blood and return of the absorbed solute to the interstitium. This is referred to as the countercurrent exchange mechanism.
What is the purpose of countercurrent exchange in the renal medulla?
Countercurrent exchange in the renal medulla. The microcirculation of the renal medulla traps NaCl and urea deposited to the interstitium by the loops of Henle and collecting ducts. Theories have predicted that countercurrent exchanger efficiency is favored by high permeability to solute.
What is countercurrent multiplication in the kidneys?
Countercurrent multiplication in the kidneys is the process of using energy to generate an osmotic gradient that enables you to reabsorb water from the tubular fluid and produce concentrated urine.
What is the function of the vasa recta?
The vasa recta serve as countercurrent exchangers, minimizing washout of solutes from the medullary interstitium. The countercurrent exchange mechanism operates as follows (Figure 28-6): Blood enters and leaves the medulla by way of the vasa recta at the boundary of the cortex and renal medulla.