Nasal lining. Coloured scanning electron micrograph (SEM) of the olfactory epithelium that lines the nasal cavity, showing olfactory cells (red) surrounded by numerous cilia (hair-like projections, green). The cilia are covered with a sticky mucus (not seen) that traps dust and other inhaled particles. Co-ordinated, wave-like beating of the cilia propels the mucus to the back of the nose (pharynx), where it is swallowed. The olfactory vesicles are bipolar neurons (nerve cells) that transmit 'smell' information to the brain. Magnification: x6500 when printed 10 centimetres wide.
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