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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

What is countercurrent exchange, and how is it beneficial for gas exchange?

Summary Introduction

To review:

The countercurrent exchange and its advantageous for the gas exchange.

Introduction:

The mode of respiration takes place in aquatic animals through the water, like fishes, they use blood capillaries for the exchange of gases. Exchange of gases seems easy in these animals due to the presence of large surface area so that they can get the maximum amount of dissolved oxygen from the surroundings. One such mechanism involved in gaseous exchange is countercurrent exchange.

Explanation

The process by which the exchange of substances takes place between two fluids in opposite directions. In fish gills, the water flowing over the gills move in one direction, which is opposite to the flow of blood in their respiratory surface. In this process, dissolved oxygen enters in the blood stream through the capillary walls by diffusion and at the same time carbon dioxide exit from it...

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