How Do In­sects Breathe?

In­sects do not have lungs, they breathe via tubes or tra­cheae, into which the air en­ters through tiny open­ings in the body sur­face. In­side the body, the tra­cheae be­come grad­u­ally smaller, reach­ing tis­sue and cells, into which the oxy­gen en­ters di­rectly.

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The in­sect's sur­face, which is cov­ered by 1 ex­oskele­ton, in­cludes tiny spir­a­cles, into which the oxy­gen en­ters. The spir­a­cles can open and close, and they have fil­ters to keep out dust. Air sacs are ex­panded to al­low air 2 into the body. A branch­ing net­work of thin tra­cheae car­ries the oxy­gen about the body and C0 out of the body. 2 The oxy­gen ex­change does not take place via 3 blood like in mam­mals, but in the thinnest tra­cheae, called tra­che­oles. They are so tiny that they can de­liver oxy­gen di­rectly to the cells.

CELL TRACHEOLE SPIRACLE SKIN SKELE­TON TRACHEA AIR SAC

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