Definition: Hemoglobin is an iron-rich protein that gives blood its red color. Hemoglobin helps red blood cells carry oxygen from the lungs throughout the body. Not having enough hemoglobin may cause anemia.
Hemoglobin
From Tracee Cornforth, former About.com Guide
Updated: August 26, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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