False-colour SEM of ciliated tracheal epithelium

False-colour SEM of ciliated tracheal epithelium

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Caption: False-colour scanning electron micrograph (SEM) of the ciliated epithelia of the human trachea, the windpipe. Cilia appear as the yellow, grass-like projections; the ciliated cells are interspersed with goblet cells (orange), that are covered in short microvilli. Factors such as temperature & humidity may stimulate the goblet cells to secrete mucous, which serves to trap large dust particles and also scrub the air of gaseous pollutants such as ozone & sulphur dioxide. Also, the cyclical beat of the numerous cilia acts as a filter to particles suspended in incoming air, sweeping any debris back towards the larynx. Magnification: x 800 at 35mm size.

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Keywords: anatomy, cilia, false-coloured, goblet cell, human body, images, magnified image, microscopic photos, respiratory system, subjects, trachea

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