Image: SEM blood cells

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)
Permission: This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use. This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. 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."
Usage Terms: Public domain
License: Public domain
Attribution Required?: No