No blood system to deliver oxygen to cells
instead use air containing oxygen is delivered directly to all the tissues by a system of tubes called Tracheae (singular:trachea).
There are a series of opening along each side of the insects abdomen- each segment has a pair spiracles (openings)
Insect makes pumping movements with its thorax and abdomen-when body expands, air sucked thru spiracles into tracheae
air then passes through series of smaller and smaller tubes- tracheoles to reach respiring tissues
walls of larger tracheae strengthened by rings of chitin
at end of each tracheole there's a small amount of tracheal fluid- the fluid allows oxygen/carbon dioxide to dissolve and diffuse
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