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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