Some information about blood

Blood is a liquid, viscous circulating tissue composed of fluid plasma and cells (red cells, white blood cells, platelets).

Red blood cells provide a color portrait folder. Red blood cell or erythrocyte (from the Greek. Erythros-red and kytos-cell) is the most common blood cell. Containing red blood pigment hemoglobin, which binds oxygen. In the center of the tetrapyrrol heme core  is bound divalent iron (Fe2 +), which is due to the presence of heme in the hydrophobic pocket protected against oxidation to Fe3 +.

White blood cells provide storage of genetic information DNA, white blood cell or blood cells called leukocyte are usually involved in the immune system of many animals. DNA (deoxyribonucleic acid) is a nucleic acid which is a carrier of genetic information of all organisms. DNA is an essential ingredient for life, which encodes in its structure and determined the program for the cells, and thus determines the evolution and properties of the whole organism.