Mechanism of respiration in cockroach, Biology

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MECHANISM -

Tergo-sternal muscles are relaxed. Volume of cavity is increased and pressure is decreased.
To full fill the pressure air comes through the passage & mixed in tracheole fluid.
Tracheole fluid comes out of tracheoles in cells so inspiration is completed.
In Expiration CO₂ is given out by same path.
Due to more permeability CO₂ is also given out through cuticle.

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