Explain about different types of blood …

Red blood cells (RBCs) : RBCs are the biconcave cells; also known as erythrocytes. RBCs contain the iron-rich protein called hemoglobin;  give blood its red color. RBCs are most copious blood cell produced in bone marrows. Their main function is to transport oxygen from and to various tissues and organs.
White blood cells (WBCs) : Leucocytes are the colorless blood cells. They are colorless because it is devoid of hemoglobin. They further classified as granulocytes and agranulocytes. WBCs mainly contribute to immunity and defense mechanism.
Platelets:  Thrombocytes are specialized blood cells produced from bone marrow. Platelets come into play when there is bleeding or hemorrhage.They help in clotting and coagulation of blood. Platelets help in coagulation during a cut or wound.