CIRCULATORY SYSTEM: DORSAL VESSEL
It is defined as open or lagoon. Regardless of the number of vessels
and how closed it may be, free blood always ends up in the general
body cavity.
RESPIRATORY SYSTEM
The respiratory system of
insects introduces respiratory
gases into the body and
performs gas exchange. The
air enters through a series of
external openings called
spiracles that lead to a
network of tubes called
tracheas. These tracheas
branch repeatedly until they
reach the trachelas.