Fish also have an efficient transport system within the lamellae which maintains the concentration gradient across the lamellae. The arrangement of water flowing past the gills in the opposite direction to the blood (called countercurrent flow) means that they can extract oxygen at 3 times the rate a human can.
Beside this, why is countercurrent flow more efficient in fish?
Fish gills use a design called ‘countercurrent oxygen exchange‘ to maximize the amount of oxygen that their blood can pick up. They achieve this by maximizing the amount of time their blood is exposed to water that has a higher oxygen level, even as the blood takes on more oxygen.
Likewise, what are the advantages of countercurrent flow? The counter-current system is an advantage of the gas exchange system in fish. It allows maximum oxygen to be absorbed by the blood from the water, by maintaining the concentration gradient the whole way through the gills.
Likewise, why is countercurrent exchange more efficient?
The exchanger is performing at its best when the outlet temperatures are equal. Counter flow heat exchangers are inherently more efficient than parallel flow heat exchangers because they create a more uniform temperature difference between the fluids, over the entire length of the fluid path.
What does countercurrent flow mean?
countercurrent exchange. 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.