respiratory
Although caterpillars are distinct from other creatures, they still need to breath. They still need to inhale oxygen and release CO2.
The tracheal system, which controls the caterpillar's breathing, filters and carries oxygen to body parts inside the caterpillar. Once oxygen entered the spiracles on the side of the caterpillar's body, it is delivered through tracheoles. Once the cells use the oxygen, the leftover carbon dioxide is sent back through the tracheoles and out through the spiracles when the caterpillar extends its body.
- Caterpillars do not breathe through a nose or mouth. Instead, they breathe through holes in the sides of their bodies called spiracles They take oxygen into the lungs by flexing the sides of their bodies. Once the oxygen is ready to be released as carbon dioxide, the caterpillar extends the sides of its body, forcing the carbon dioxide from the body.
The tracheal system, which controls the caterpillar's breathing, filters and carries oxygen to body parts inside the caterpillar. Once oxygen entered the spiracles on the side of the caterpillar's body, it is delivered through tracheoles. Once the cells use the oxygen, the leftover carbon dioxide is sent back through the tracheoles and out through the spiracles when the caterpillar extends its body.