| Unit
1 - Fish
Blood Constituents
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| Blood |
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| Tissue composed of circulatory cells in a liquid medium, plasma, or in the case of some invertebrates, haemolymph . The role of blood is to carry oxygen, food-materials and excretory products through the body to different organs and tissues. It usually contains respiratory pigments. Blood is circulated by the muscular action of vessels or specialised organs (hearts). | |
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