14. What is the type of
circulatory system present in
arthropods? Do these animals
have heart and respiratory
pigments?

Gap-fill exercise

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In arthropods the system is
open (). Blood, also known
hemolymph, is pumped a heart and
into cavities (lacunas)
and draining tissues.

arthropods have a .
Crustaceans and arachnids
respiratory pigments. Insects not
have respiratory since their
blood not carry gases ( them
gases reach and cells through
structures).