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Above is a diagram of an open circulatory system. An open circulatory system is made up of a heart, vessels, and hemolymph. This diagram shows how the hemolymph, fluid present in most invertebrates that is equivalent to blood, is circulated throughout the body of a grasshopper.
Blood is a fluid that flows through the body. It is thicker than water and is salty to taste. There are about 10.6 pints of blood that circulates through the body of a normal adult. What is Blood Made Up of? Blood is made up of cells in a watery base, called plasma. There are three major types of cells blood made up of â red blood cells (RBCs), while blood cells (WBCs) and platelets. Red blood cells