Image: SEM blood cells

Original image(1,800 × 2,239 pixels, file size: 1.33 MB, MIME type: image/jpeg)

Description: English: 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 that 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. All blood cells are formed in the bone marrow. 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
Title: SEM blood cells
Credit: Image and description: National Cancer Institute
Author: Bruce Wetzel (photographer). Harry Schaefer (photographer)
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Usage Terms: Public domain
License: Public domain
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