adult respiratory system A system of tracheal trunks and anastomosing tracheae that extend throughout the body, capitulum and legs to supply oxygen tothe cells and tissues and remove waste CO2. The tracheae end in tracheoles within the individual tissues. Opens to the exterior via the paired spiracles on the lateral margins of the body. Adult tracheal system TADS:0000043 TADS:0000043 default_namespace anatomical cluster