Respuratory System Histology : Main Pathways Treachea left- right Bronches; Colored SEM of a section through the trachea: The lining consists of mucus-secreting goblet cells (center, pink) and epithelial cells (vertical) that are covered in cilia.
As pretty as a picture (but a lot more deadly): Killer diseases as you've never seen them before
Smallpox (Variola) virus particles: each particle consists of genetic material (DNA - red) enclosed by a protein capsid (yellow)
Bubonic plague bacteria (yellow) on part of the digestive system in a rat flea (purple). Credit: B. Joseph Hinnebusch, Elizabeth Fischer and Austin Athman, National Institute of Allergy and Infectious Diseases, National Institutes of Health.