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wood prints scanning electron micrograph wood prints scanning electron microscopy wood prints sem wood prints microscopy wood prints micrograph wood prints red blood cell wood prints erythrocyte wood prints circulatory system wood prints white blood cell wood prints platelet wood prints leukocyte wood prints thrombocyte wood prints lymphocyte wood prints monocyte wood prints neutrophil wood prints

photographs scanning electron micrograph photos scanning electron microscopy photos sem photos microscopy photos micrograph photos red blood cell photos erythrocyte photos circulatory system photos white blood cell photos platelet photos leukocyte photos thrombocyte photos lymphocyte photos monocyte photos neutrophil photos

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Scanning electron micrograph (SEM) of normal circulating human blood. One can see red blood cells, several white blood cells (including lymphocytes, a monocyte, a neutrophil, and many small disc-shaped platelets. Blood circulates through the heart, arteries, capillaries, and veins. It is composed of red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes) suspended in plasma, which is a straw-colored fluid composed of proteins, water, and salts. Erythrocytes are made in the bone marrow. Mature red blood cells are non-nucleated. In place of a nucleus, they contain hemoglobin. The iron in hemoglobin is an important protein which allows the cell to carry oxygen to other parts of the body. Erythrocytes also carry away carbon dioxide from the body cells to the lungs where it is expelled through the process of breathing. The infection-fighting leukocytes are classified in two main groups granular and agranular. Granulocytes are formed in bone marrow, and i...