ANATOMY

Detailed explanation-1: -For insects, respiration is separate from the circulatory system. 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.

Detailed explanation-2: -Spiracles. Spiracles are the openings of the tracheal system on the integument of the insect. Some apterygote and larval insects lack valves in their spiracles and therefore have trachea that are always open to the environment, although these are often covered with sieve-like plates.

Detailed explanation-3: -Air enters the respiratory systems of insects through a series of external openings called spiracles. These external openings, which act as muscular valves in some insects, lead to the internal respiratory system, a densely networked array of tubes called tracheae.

Detailed explanation-4: -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-5: -Spiracles are small openings present on the sides of the body of insects, like cockroaches. Spiracles help in entry and exit of gasses for respiration.