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Counter current flow in gills refers to the flow of water moving over the gill filaments in the opposite direction to the flow of blood within the filaments. This arrangement allows for efficient extraction of oxygen from water as it maximizes the concentration gradient between the water and the blood. This means that oxygen is continuously diffusing into the blood along the entire length of the gill filament, making gas exchange more effective.

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Comparison of Counter-current flow and parallel flow?

Counter-current flow is more efficient then parallel flow. Shahzad, MUET Chemical Engineer


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A Counter-current flow has more advantages as comapared to a co-current flow.


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A jellyfish does not have any circulatory vessels. They use diffusion as their means of circulation. They do not have a closed circulatory system.


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thy have gills that works in a counter current action


Why is counter current flow more effective?

Counter current flow is more effective because it allows for a greater concentration gradient to be maintained along the entire length of the exchange surface. This maximizes the diffusion of substances from one side to the other, leading to a more efficient exchange of materials. Additionally, counter current flow ensures that the exchange process can continue over a longer period of time, further increasing its efficiency.


Why is the counter current flow more efficient for gas exchange than parallel flow?

Counter current flow allows for a steeper concentration gradient along the entire length of the exchange surface, resulting in a higher diffusion rate of gases. In parallel flow, the concentration gradient is not maintained along the entire length, leading to lower gas exchange efficiency.


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