Explanation. Gaseous exchange occurs in insects via the tracheal system, a network of internal tubes that extends to all areas of the body and can become functionally intracellular in muscle fibres.
As a result, oxygen is taken straight to the locations where it is needed, and the blood is indifferent about its transportation.
Terrestrial insects and some aquatic species have spiracles, which are segmental apertures that open to the outside.
To prevent water loss from the respiratory surfaces, this usually has a closing mechanism.
Gaseous exchange with the water is done by arrays of tracheae lying just beneath the surface of a thin, porous cuticle in other aquatic organisms that lack functional spiracles.
Final Answer: The tracheal system, a series of internal tubes, allows insects to exchange gases.