Gaseous Exchange in Fish 0.0 / 5 ? BiologyExchange surfacesA2/A-levelAQA Created by: me543Created on: 22-02-18 16:07 Where does oxygen pass from the water to the blood? The Gills 1 of 8 How does oxygen enter the blood? It diffuses down a diffusion gradient 2 of 8 What happens to carbon dioxide at the gills? It is removed 3 of 8 What are gills protected by? A flap of tissue called the Operculum 4 of 8 What is each gill composed of? Filaments 5 of 8 What are filaments covered in? Lamellae (which contain blood capillaries) 6 of 8 What is it called when blood flows in the opposite direction to water? A countercurrent system 7 of 8 Which direction will water flow? From an area of higher pressure to an area of lower pressure. 8 of 8
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