STRUCTURE AND FUNCTIONS OF RESPIRATORY SYSTEM
Similar to aerobic animals, insects must obtain oxygen from their environment and
eliminate carbon dioxide respired by their cells. This is
gas exchange
through series of gas filled
tubes providing surface area for gaseous exchange (Respiration strictly refers to oxygen-
consuming, cellular metabolic processes). Air is supplied directly to the tissue and no
haemolymph (blood) is involved in the respiratory role. Gas exchange occurs by means of internal
air-filled
tracheae
. These tubes branch and ramify through the body. The finest branches called
tracheloe
contact all internal organs and tissues and are numerous in tissues with high oxygen
requirements. Air usually enters the tracheae via
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