MICROANATOMY

Detailed explanation-1: -Insects have a tracheal respiratory system in which oxygen and carbon dioxide travel primarily through air-filled tubes called tracheae. Usually the tracheal system penetrates the cuticle via closeable valves called spiracles and ends near or within the tissues in tiny tubes called tracheoles.

Detailed explanation-2: -Insects respire through the openings in their skin or exoskeleton. These openings are called as spiracles. The air enters through spiracles and goes into internal respiratory system which is made up of densely networked array of tubes called tracheae.

Detailed explanation-3: -Oxygen and carbon dioxide gases are exchanged through a network of tubes called tracheae. Instead of nostrils, insects breathe through openings in the thorax and abdomen called spiracles.