THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Respiration in insects such as cockroaches, houseflies, etc., occurs through a tracheal system. The tracheal system connects with the external environment through tiny pores on the insect’s abdomen and thorax called spiracles. A pair of spiracles are present on each body segment.

Detailed explanation-2: -Spiracles are respiratory openings found on the thorax and abdomen of insects. The spiracles are connected to trachea-tubes within the insect’s body. Air enters the trachea via the spiracles and the oxygen then diffuses into the insect’s body.

Detailed explanation-3: -Spiracles: Some species of animals have openings on the skin’s surface that lead to the airways known as Spiracles. Insects may have it in the exoskeleton, which allows air to enter an area called the trachea. They can be located laterally along the chest and are found in the abdomen of some insects.

Detailed explanation-4: -A spiracle or stigma is the opening in the exoskeletons of insects, myriapods, velvet worms and some spiders to allow air to enter the trachea.