These corpuscles, together with plasma, make up blood. Red blood cells have their own characteristic color, due to which the blood is red. These cells are composed of their hemoglobin, which is able to create bonds with oxygen and carbon dioxide. Erythrocytes of mammals lack a nucleus, and many other animals have poison in the structure of erythrocytes. Leukocytes are of several types. Their function is to protect the body from foreign enemy agents. Platelets are needed to create blood clots when blood vessels are damaged to block them.
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