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53.6 MB (2.7 MB compressed)
5000 x 3750 pixels
42.4 x 31.8 cm ⏐ 16.7 x 12.5 in (300dpi)
PASIEKA / SCIENCE PHOTO LIBRARY PASIEKA / SCIENCE PHOTO LIBRARY
White blood cell with red blood cells in the background, computer artwork. White blood cell (leucocytes) are rounded cells with microvilli projections from the cell surface. These microvilli may assist in cell motility. Lymphocytes are involved in the immune response, acting to protect the body against infection. Two main types of lymphocytes occur in the human body: T-cells and B-cells. T- cells (thymus-derived) track down and help to actively destroy foreign bodies. B-cells (bone marrow derived) identify foreign microorganisms and then make antibodies. The disc- shaped red blood cells in the background of the image (erythrocytes), transport oxygen to the body cells and remove carbon dioxide to the lungs.
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