molly.butcherx
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Saw this on the OCR A specification and cannot find it in my text book. I understand the trachaea system, and the spiracles, and the fact that insects have air sacs that can store small amount of gas, but I don't understand how this works if the trachaea system is almost separate to the abdominal area (unless Im getting confused)?

Many Thanks!
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lcschofield
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If it squeezes it’s abdomen, the volume of the thorax decreases, so air is forced out of spiracles. If it relaxes it’s abdomen, the volume of the throat increases, so air can flow into the spiracles.
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