GCSE Biology 3rd edition IGCSE Biology 3rd edition

Fish Swimming

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Fish Swimming

Fish swim by contracting the muscles down each side of the body in turn. The muscles pull on the vertebral column and produce wave-like undulations which travel down the length of the fish pushing sideways and backwards against the water. The sideways components cancel each other but the resistance of the water to the backwards component causes the fish to move forwards. The thick arrows show the movement of the body. The thin arrows show the reaction of the water

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