The circulatory system of arthropods.

The main feature of the circulatory system of arthropods is the absence of real blood. It is replaced by hemolymph (blue), in which red blood cells and hemoglobin are absent. It consists of plasma, inorganic and organic salts. Instead of hemoglobin, hemocyanin is contained, which performs the same function as hemoglobin – oxygen transport. The circulatory system is not closed. From the heart, the blood is pushed into the blood vessels, then from the vessels in the body cavity between the organs, and then returns to the heart through other vessels.