white blood cells inside the blood vessel

and antibiotic antibody artery bacterium blood capillary cell computer digestive disease duodenum erythrocyte flu graphic healthcare hemoglobin human illness imune inflammation internal intestinal intestine large leukocyte lymphocyte macrophage magnification medicine micro microbial microbiology molecule organ organelle organism pathogen phagocyte pharynx plasma receptors red science system ulcer ulcerates unicellular vein vessel virus world