hemolymph
Insect Emolysis, sometimes also called blood, is a fluid tissue that performs functions similar to those of the blood and vertebrate lymph. Unlike blood, hemolymph has a higher viscosity, is free from red blood cells and, in general, insects, of respiratory pigments due to hemoglobin. It consists of a liquid fraction and a cell. Plasma is 92% water, a density of about 1.1, neutral or weakly acidic and has osmotic properties more intense than blood. Among the dissociated substances are proteins, lipids, glucids, enzymes, hormones, mineral salts, and nitrogenous metabolism products. There are also carotenoids, responsible for yellow or green coloration, more rarely other pigments such as hemoglobin or hemocyanin. In some insects there are also caustic or toxic substances, which have a supposed deterrent function in the defense of predators. The cellular fraction of the hemolymph is composed of differentiated cell types, generically called hemocytes, in the number of 30-50,000 per mm3.