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| Keywords: SEM blood cells.jpg http //visualsonline cancer gov/details cfm imageid 2129 National Cancer Institute Date Created February 1982 Bruce Wetzel photographer Harry Schaefer photographer PD-USGov http //visualsonline cancer gov/about cfm All images are in the public domain and may be used linked or reproduced without permission If an image is used credit should be given to the listed source and/or author Homeostasis del eritrocito y la hemoglobina jpg രക്തകോശങ്ങൾ jpg ImageNote 1 1744 1272 30 30 1800 2239 2 This is a scanning electron microscope image from 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 Red cells are nonnucleated and contain hemoglobin an important protein which contains iron and allows the cell to carry oxygen to other parts of the body They also carry carbon dioxide away from peripheral tissue to the lungs where it can be exhaled The infection-fighting white blood cells are classified in two main groups granular and agranular Granulocytes are formed in bone marrow; agranulocytes are produced by lymph nodes and spleen There are two types of agranulocytes lymphocytes which fight disease by producing antibodies and thus destroying foreign material and monocytes Platelets are tiny cells formed in bone marrow and are necessary for blood clotting Type Black White Print ImageNoteEnd 1 Monocytes Lymphocytes Scanning electron microscopic images Neutrophils | ||||
