Blood

Blood is the fluid have function sends substances and oxygen needed by body tissues, carrying chemical products of metabolism, as well as the body's defense against viruses or bacteria.

In insects, blood (hemolimfe) is not involved in the circulation of oxygen. Oxygen is circulated through the insect tracheal system of ducts that channel air directly to body tissues. Insect blood transports substances to the body tissues and remove metabolic waste products. In other animals, the main function of blood is to transport oxygen from the lungs or gills to body tissues.

Hemoglobin contained in blood that serves as the binding of oxygen. In most invertebrates or invertebrates are small, the direct oxygen plasma to seep into the blood as oxygen carrier proteins freely dissolved.

Hemoglobin is the oxygen-carrying protein found in the most effective and vertebrate animals or vertebrates. Hemosianin, contains copper have a blue color and is used by animal’s crustaceans. Squid using vanadium kromagen (light green, blue, yellow or orange).

Some examples of diseases associated with blood. Hemophilia is a genetic disorder that causes a malfunction in a person's blood clotting. As a result, minor injuries can be life threatening. Leukemia is a cancer on the body-forming tissues of white blood cells. This disease occurs due to an error in cell division resulting in white blood white blood cell count increased and then takes normal white blood cells.

Source from: Wikipedia