In cockroach, respiration takes place through a small openings on the sides of its body called spiracles. When the air enters the respiratory system of a cockroach through these external openings, spiracles act as muscular valves, leading to the internal respiratory system. The respiratory organ of cockroach is known as tracheae.
The trachea is a dense networked array of air tubes in the internal system. These tracheae balance the pressure within the system. As the oxygenated air from the atmosphere enters into the cockroach’* body through the spiracles into the tracheal tubes, it penetrates into the different cells and tissues of the body, where the oxygen gas is utilized to release energy. Similarly, the air rich in carbon dioxide, which is the product of the respiratory process, goes into the tracheae and moves out through the spiracles.
