in a grasshopper what relationship exists between a spiracle and a tracheal tube? what is it's function

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.