Explain respiratory system in cockroach. Draw labelled diagram.
Answers
Explanation:
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.
Answer:
It represents the air respiration which takes place with the help of tracheal system. The tracheal system carries oxygen directly to the tissues. This includes the spiral and trachea. Spiral: It consists of 10 pairs of spirals also known as stigmata. The first two pairs of spiracles are found vento-laterally in the pro/mesothrax and meso/metathorax. The first pair of abdominal spiracles are found dorsally on the first abdominal segments. Seven pairs of spiracles are found ventro-laterally on the pleura in the 2nd to 8th segment; each spiracle is oval and is surrounded by a chitinous ring called the peritrium. The spirals are provided with ciliary bristles which filter the inspired air. Thoracic spiracles are comparatively large. The first thoracic and first abdominal spiracles remain open permanently. The rest of the spiracles open only at the time of inspiration and are provided with valves. Each spiral drains into a smaller chamber, the tire tracheal chamber, or atrium. Hence, there are 10 pairs of atria. Trachea: The trachea is also called wind pipe and it originates from the ectoderm. It consists of three pairs of longitudinal tracheal trunks. Dorso-lateral tracheal trunk-1 pair lateral tracheal trunk-1 pair ventro-lateral tracheal trunk-1 pair 10 atria on one side open into the ventro-lateral tracheal tracheal trunk on its side. All six longitudinal tracheal trunks are attached to each segment by a transverse connecting trachea. The trunks of the trachea divide to form the trachea. The trachea is a thin-walled, elastic and silvery-white tube. Their walls are supported by spiral rings made of chitin. Each trachea ends in a tracheal cell. The tracheal cell bears 3 to 5 intracellular tubules called tracheoles. Tracheols are tubules of 1 µm diameter. They are silvery white in color and their walls are supported by spiral rings made of trachein proteins, the inner ends of the tracheoles are closed and filled with tracheal fluid. This tracheal fluid helps in the exchange of gases. The lining of the trachea is called the intima. Mechanism of Respiration: Respiration in cockroach is done by contraction and relaxation of tergosternal muscles. As a result of the contraction of the tergosternal muscles, air is expelled which is called expiratory. By relaxing the tergosternal muscles, the pressure on the trachea is reduced, resulting in air entering the body through the spiracles. This is called inspiration. The process of breathing during rest is involuntary and during the active phase, it is a voluntary process. Gases are exchanged by diffusion between the tracheal fluid and the tissue fluid. The passage of air during breathing is as follows- Read more on Sarthaks.com - https://www.sarthaks.com/802476/explain-respiratory-system-in-cockroach-draw-labelled-diagram