1. UNIT 2 The nutrition function Natural Science 2. Secondary Education HOW SOME ANIMALS TAKE OXYGEN FROM THE WATER

2. UNIT 2 RESPIRATION IN WATER THROUGH THE BODY SURFACE THROUGH GILLS Click on each box to find out more How some animals take oxygen from the water is carried out Natural Science 2. Secondary Education

3. UNIT 2 This is seen in animals that live underwater or in very wet environments, like the soil. Sponges, cnidarians (polyps and jellyfish), worms and some amphibians absorb air in this way. Respiration through the body surface The animal absorb O 2 through its surface The animal eliminates CO 2 through its surface O2O2 O2O2 CO 2 Respiration through the body surface in an annelid. Go back to the Start menu Wet environment Body surface How some animals take oxygen from the water Natural Science 2. Secondary Education

4. UNIT 2 Gills are very thin sheets or filaments full of capillaries. When water passes through the gills, carbon dioxide from the circulating liquid inside the organism is exchanged for oxygen from the water. Gills are the respiratory organs of aquatic molluscs, crustaceans, fish and some amphibians. Respiration through gills Blood with O 2 Blood with CO 2 Water Water with O 2 Water with CO 2 Respiration through gills in a fish. O2O2 CO 2 How some animals take oxygen from the water Go back to the Start menu Natural Science 2. Secondary Education