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Spiracles
valves where CO2 leaves and O2 enter via diffusion in an insect
Trachea
Tubes which lead off from the spiracles and branch off into tracheoles
Tracheoles
have thin walls and are branched meaning oxygen diffuses directly into respiring cells
insect circulatory system does not carry oxygen
how insects move air in and out of the spiracles
by pumping their abdominal
Purpose of spiracles valves closing
reduces water loss