Assertion: insect's system | /r/HasProperty | open
Facets:
Source sentences:
text: The insect circulatory system is open; it has no veins or arteries, and instead consists of little more than a single, perforated dorsal tube that pulses peristaltically.
text: The circulatory system is an open one, with most of the body fluid, or hemolymph, occupying cavities of the body and its appendages.
text: Rather than closed vessels such as arteries and veins shuttling blood around, insects have an open circulatory system, in which their blood, called "hemolymph," bathes the organs.