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In grasshoppers respiration takes places through the tracheae and spiracles. Tracheae are tubes filled with air, which have an opening at the surface of the thorax and abdomen of the grasshopper through the pair of spiracles. The valves of the spiracles are designed such that they open only to let in oxygen and let out carbon dioxide, thereby enabling the oxygen and carbon dioxide exchange. Oxygen is carried to all the cells of the body by tracheoles which are found at the end of the tracheal tubes and form a link between all the cells and the tracheal tubes.
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