write a short note on the respiratory system of insects
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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.
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The process of breathing in insects such as grasshopper and cockroach is very slow. Insects do not breathe like human beings. Insects do not have lungs to do respiration. In insects respiration takes place through tracheae. Tracheae are tube like structures that open on the sides of their body through tiny holes called spiracles. Each trachea is further divided into fine tubules called tracheoles which reach all the parts of the body. During respiration, the oxygen rich air enter in the body of these insects through spiracles and reach all the cells of the body by passing through network of trachea and tracheoles. Thus, every cell gets oxygen directly. In the cells oxygen gas is used up to break the food particles. During breaking up of food a large amount of carbon dioxide gas and energy is produced. The carbon dioxide produced during respiration is released out of the body through the same network of trachea and tracheoles.
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