Question: How Does The Countercurrent Multiplier System Work?

What is the result of the countercurrent multiplication mechanism quizlet?

-To conserve water, the countercurrent mechanism generates urine with osmolality greater than plasma.

This concentrated urine is produced when ADH is present in the plasma (normal physiological condition).

-To excrete water, the countercurrent mechanism generates urine with osmolality less than plasma..

What is the main function of the countercurrent multiplier mechanism?

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 are the structural and functional unit of kidney called?

nephronsNephron, functional unit of the kidney, the structure that actually produces urine in the process of removing waste and excess substances from the blood. There are about 1,000,000 nephrons in each human kidney.

Where does the countercurrent multiplication occur?

What does it do? occurs by facilitated diffusion in the medullary collecting duct. It accumulates in the inner medulla and contributes to the hypertonic ISF.

What is meant by Vasa recta?

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 region of the nephron is water actively transported?

Anatomy ch 20QuestionAnswerThe reabsorption of glucose occurs primarily through the walls of theProximal convoluted tubuleWhat increases the rate of glomerular filtration?Increased blood pressureWhat regions of the nephron is water actively transported?None of the above33 more rows

Where would Penicillin be secreted in the nephron?

For example, penicillin readily enters the nephron by tubule secretion and is rapidly excreted from the body in the urine.

When aldosterone causes sodium reabsorption why doesn’t water automatically follow?

When aldosterone causes sodium reabsorption, why doesn’t water automatically follow? A.) There is no need for water to follow because reabsorbed sodium does not change ECF osmolarity.

What is the effect of countercurrent multiplier in the loop of Henle quizlet?

What is the effect of countercurrent multiplier in the nephron loop (loop of Henle)? Water is reabsorbed. Where does the reabsorption of ions occur in the nephron to produce a hyposmotic solution in the tubules? water loss only.

What is the difference between peritubular capillaries and 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.

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%.

What is urea used for in the countercurrent multiplier?

The function of the countercurrent multiplier is to produce the hyperosmotic Medullary Interstitium. … Urea reabsorbed from collecting duct to medullary interstitum produces the hyperosmotic Medullary interstitium. Reabsorption of urea will occur in the presence of ADH.

What three hormones factors do the kidneys secrete into the blood?

The kidney secretes (1) renin, a key enzyme of the renin-angiotensin system (RAS) that leads to the production of a potent pressor hormone angiotensin, and produces the following hormones and humoral factors: (2) kallikreins, a group of serine pro- teases that act on blood proteins to produce a vasorelaxing peptide …

What substances are reabsorbed in the distal convoluted tubule and collecting duct?

ReabsorptionTable 1. Substances Secreted or Reabsorbed in the Nephron and Their LocationsSubstanceProximal convoluted tubuleDistal convoluted tubulePotassium65 percent reabsorbed; diffusionSecreted; activeCalciumReabsorbed; diffusionMagnesiumReabsorbed; diffusionReabsorbed15 more rows

How does the countercurrent mechanism work?

The counter-current multiplier or the countercurrent mechanism is used to concentrate urine in the kidneys by the nephrons of the human excretory system. … As urine flows downwards in the collecting tubule, it encounters higher and higher concentrations of solutes in the interstitium.

What is the difference between a countercurrent multiplier system?

Unlike the other countercurrent systems, a countercurrent multiplier system expends energy in active transport. … This expended energy distinguishes a countercurrent multiplier system from the other countercurrent systems.)

What is the function of vasa recta?

Vasa Recta Function Not only do the vasa recta bring nutrients and oxygen to the medullary nephron segments but, more importantly, they also remove the water and solute that is continuously added to the medullary interstitium by these nephron segments.

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.