00:01
Hello everyone, the question it says that we have been provided with a few examples and we have been asked that which of them is not a countercurrent example.
00:11
First let us understand which are the countercurrent examples.
00:15
Now examples of countercurrent, the first is the fish gills.
00:21
Fish gills, all right? that is the principle of countercurrent exchange.
00:27
It can be illustrated using fish gills.
00:29
In the gills, oxygen diffuses from an area of higher concentration, the water into an area of lower concentration, that is the fish's bloodstream.
00:41
Now first you consider what would happen under same or concurrent exchange.
00:49
If oxygen -rich water and oxygen -deficient blood flow in the same direction, the diffusion it occurs into the bloodstream until equilibrium is reached.
00:58
Thus, the maximum amount of oxygen that can enter the blood at any given time is only 50 % of the total oxygen...