The circulatory fluid in invertebrate animals like insects and spiders, which serves the same function as blood in vertebrates.
From hemo- (blood) + lymph (Latin lympha, clear fluid). This zoological term was coined to describe the blood-like fluid in arthropods and other invertebrates, recognizing that it combines functions of both blood and lymph in vertebrates.
Hemolymph is nature's proof that you don't need blood vessels to have working circulation—insects pump this fluid around in open-ended tubes and spaces, and somehow their tiny bodies manage oxygen just fine without capillaries.
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