Haemolymph

Hemolymph or haemolymph is a body fluid that circulates inside arthropod bodies transporting nutrients and oxygen to tissues, comparable to blood in vertebrates. It is composed of a plasma in which circulating immunecells called hemocytes are dispersed in addition to many plasma proteins (hemoproteins) and dissolved chemicals. It is the key component of the open circulatory system characteristic of arthropods such as insects, arachnids, myriapods and crustaceans. Some non-arthropod invertebrates such as molluscs and annelids also possess a similar hemolymphatic circulatory system.