Grasshoppers and other related arthropods perform their activities with the help of trachea. These are the air filled tubes that are generally open at the surfaces of the thorax along with their abdomen with the help of a pair of spiracles. Spiracles are a kind of valves that allow oxygen to enter and carbon dioxide to escape. They are only used for the purpose of respiration. These tracheoles are found at the end of the tubes i.e. The tracheal tubes. They are insinuated between the cells. They carry the oxygen all through their body. Now, many of the terrestrial arthropods have evolved a sort of close respiratory system that is only composed of the spiracles, tracheae and the tracheoles. These are present for the purpose of transporting the metabolic gases to and from the various tissues.