Quick Answer: What Is Counter Current Exchange System?

What is a countercurrent exchange system?

a biological mechanism designed to enable maximum exchange between two fluids.

The mechanism’s effect is dependent on the two fluids flowing in opposite directions, and having a concentration gradient between them..

What is the countercurrent mechanism Why is it important?

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 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.

What is the countercurrent system in fish?

Fish gills use a design called ‘countercurrent oxygen exchange’ to maximize the amount of oxygen that their blood can pick up. … Countercurrent oxygen exchange (shown in the figure above) means the blood flows through the gills in the opposite direction as the water flowing over the gills.

Do humans use countercurrent exchange?

Many animals (including humans) have another way to conserve heat. … Such a mechanism is called a countercurrent heat exchanger. When heat loss is no problem, most of the venous blood from the extremities returns through veins located near the surface.

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 an example of countercurrent exchange?

Venous blood recovers heat from the arterial blood as the former warms on its way back to the body. Blood vessels in the neck also employ a countercurrent arrangement and that results in a brain temperature about 1°C cooler than that of the body. (A countercurrent exchange of blood oxygen occurs in the gills of fish.)

How does countercurrent flow work?

This is the way that a fish’s gills absorb the maximum amount of oxygen from the water. Water flows in the opposite direction to the blood flow in the gills to ensure that there is always a higher concentration of oxygen in the water than the concentration of oxygen in the blood.

Why counter current multiplier is called so?

Because the blood flow through these capillaries is very slow, any solutes that are reabsorbed into the bloodstream have time to diffuse back into the interstitial fluid, which maintains the solute concentration gradient in the medulla. This passive process is known as countercurrent exchange.

Do humans use countercurrent gas exchange?

Countercurrent exchange uses Diffusion to passively (no energy required) transfer the oxygen across to the blood. … Fish have lower metabolic rates than humans, and so their oxygen requirements are much lower than mammals and can live without hemoglobin.

What is co current and counter current flow?

co-current flow is the flow in which both the fluid streams enter the equipment in the same direction whereas for in the counter-current flow the streams enter at opposite ends of the equipments. … Co-current flow is preferred in rare cases of heat transfer where a quick heat transfer is required.

What is counter current system?

A countercurrent mechanism system is a mechanism that expends energy to create a concentration gradient. … For example, it can refer to the process that is underlying the process of urine concentration, that is, the production of hyperosmotic urine by the mammalian kidney.

Which of the following is an example of countercurrent exchange?

For example, fish use it in their gills to transfer oxygen from the surrounding water into their blood, and birds use a countercurrent heat exchanger between blood vessels in their legs to keep heat concentrated within their bodies.

What is counter current flow in dialysis?

Dialysate Flow 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 the advantage of counter flow system?

In countercurrent exchange, the water and blood are flowing in opposite directions. In short, transfer of oxygen in a countercurrent exchange system can be almost 100% efficient – twice the maximum efficiency of a concurrent exchange system – with a simple reversal of the direction of flow for one of the fluids.