THORAX ABDOMEN AND PELVIS

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: -The respiratory system of holometabolous insects comprises a network of gas‐filled, cuticle‐lined tubes (tracheae and tracheoles) located inside the body, which exchange respiratory gases between the tissues and the environment (e.g. Tonapi, 1977; Lowe et al.