Fish use a countercurrent system for gas exchange, where water flows in the opposite direction to blood flow in the gills, maintaining an oxygen concentration gradient for efficient diffusion.
Os peixes usam um sistema de contra-corrente para a troca gasosa, onde a água flui em direção oposta ao fluxo sanguíneo nas brânquias, mantendo um gradiente de concentração de oxigênio para difusão eficiente.
| Front | How do fish use a countercurrent system for gas exchange |
|---|---|
| Back | 1. water enters fish through the mouth 2.gills made of gill filaments creating a large surface area for diffusion of gases 3. Gill filaments covered in lamellae which increase the surface area 4. Lamellae covered in blood capillaries to decrease diffusion distance and maintain concentration gradient. 5. Blood flows in opposite direction to water flow. This allows the fish to maintain a concentration gradient between water and blood. The concentration of oxygen in water> concentration of oxygen in blood. |
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