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The Respiratory System of a Butterfly

Updated July 20, 2017

Butterflies are often considered the epitome of metamorphosis; they start life as caterpillars, which resemble worms with legs, and then transform into beautiful, winged insects. These colourful creatures change their entire body structure during this transition, which takes place inside a cocoon. Learn about the respiratory system of the butterfly to improve your understanding of this insect's tiny anatomy.

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Abdomen

The abdomen is the cone-shaped section of the butterfly's body. It extends beyond the legs, and houses the organs responsible for breathing.

Passive Respiration

Butterflies don't use active respiration organs like lungs, which require the animal to inhale a breath using specialised muscles. Instead, butterflies utilise a passive form of respiration, which requires no active participation of the butterfly. Passive respiration uses chemical processes to take in oxygen.

Spiracles

Spiracles are the mechanism through which butterflies take in oxygen and expel carbon dioxide. Spiracles are located along the length of the body, but mainly focused down the sides of the abdomen. Some spiracles are dedicated to taking in oxygen, while others are used to expel carbon dioxide.

Tracheal Tubes

Tracheal tubes are found throughout the butterfly's body, and they are responsible for diverting the oxygen to the different parts of the body. Since oxygen isn't transported through blood (as in animals with lungs), the tracheal tubes are the only way for oxygen taken in by the spiracles to reach the butterfly's body.

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About the Author

Matthew Cote started writing professionally in 2008. He has contributed to TriangleArtsandEntertainment.org, as well as numerous Web sites with Collective Clicks, including Buzzabout.com. Cote holds a B.A. in English with a concentration in language, writing and rhetoric from North Carolina State University.

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