
the interior of the insects anatomy, including all organs and hemocyte.
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http://en.wikipedia.org/wiki/Glossary_of_entomology_terms

(from the article `circulation`) Blood and coelomic fluid are often physically separated by the blood-vessel walls; where a hemocoel (a blood-containing body cavity) exists, however, ... [5 related articles]
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http://www.britannica.com/eb/a-z/h/35

A body cavity in arthropods and molluscs that is a blood-filled, expanded portion of the circulatory system. Unlike the coelom, which is small in arthropods and molluscs, the hemocoelum does not communicate with the exterior and never contains gametes (germ cells).
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http://www.daviddarling.info/encyclopedia/H/hemocoel.html

Main body cavity of arthropods, the embryonic development of which differs from that of a true coelom but which includes a vestige of a true coelom.
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http://www.encyclo.co.uk/visitor-contributions.php

hemocoel 1. A cavity or series of spaces between the organs of most arthropods and mollusks through which the blood circulates. 2. A series of interconnected spaces between tissues and organs through which blood flows freely, unconfined by veins or arteries, occurring in several invertebrate groups; especially, mollusks and arthropods.
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http://www.wordinfo.info/words/index/info/view_unit/970/6
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