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Gas Exchange Fish Takes Place Gills Explain Features

Gill features facilitating efficient gas exchange include filaments/lamellae for large surface area and a thin epithelium providing a short diffusion pathway, while countercurrent flow maintains the diffusion gradient.

Gill features facilitating efficient gas exchange include filaments/lamellae for large surface area and a thin epithelium providing a short diffusion pathway, while countercurrent flow maintains the diffusion gradient.

Front Gas exchange in fish takes place in gills. Explain how two features of gills allow efficient gas exchange. ( 2 marks)
Back Filaments/lamellae provide large surface area;

Thin/flattened epithelium/one/two cell layers so short diffusion pathway (between water and blood);

Countercurrent/blood flow maintains concentration/diffusion gradient;

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