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Organisation of cells animal tissues (view source)
Revision as of 05:58, 3 August 2014
, 05:58, 3 August 2014→Notes for teachers
In cells lining blood vessels or lung alveoli, where transportation of substances occurs through a selectively permeable surface, there is a simple flat kind of epithelium. This is called the '''simple squamous epithelium'''. Simple squamous epithelial cells are extremely thin and flat and form a delicate lining.The oesophagus and the lining of the mouth are also covered with squamous epithelium. The skin, which protects the body, is also made of squamous epithelium. Skin epithelial cells are arranged in many layers to prevent wear and tear. Since they are arranged in a pattern of layers,the epithelium is called '''stratified squamous epithelium'''.<br>
In cells lining blood vessels or lung alveoli, where transportation of substances occurs through a selectively permeable surface, there is a simple flat kind of epithelium. This is called the '''simple squamous epithelium'''. Simple squamous epithelial cells are extremely thin and flat and form a delicate lining.The oesophagus and the lining of the mouth are also covered with squamous epithelium. The skin, which protects the body, is also made of squamous epithelium. Skin epithelial cells are arranged in many layers to prevent wear and tear. Since they are arranged in a pattern of layers,the epithelium is called '''stratified squamous epithelium'''.<br>
http://science.tjc.edu/Course/BIOLOGY/1409/squamoushigh.jpg
'''Simple squamous epithelium'''
'''Simple squamous epithelium'''
Where absorption and secretion occur, as in the inner lining of the intestine, tall epithelial cells are present called '''columnar epithelium'''. This columnar (meaning ‘pillar-like’) epithelium facilitates movement across the epithelial barrier. In the respiratory tract, the columnar epithelial tissue also has cilia, which are hair-like projections on the outer surfaces of epithelial cells. These cilia can move, and their movement pushes the mucus forward to clear it. This type of epithelium is thus '''ciliated columnar epithelium'''.<br>
Where absorption and secretion occur, as in the inner lining of the intestine, tall epithelial cells are present called '''columnar epithelium'''. This columnar (meaning ‘pillar-like’) epithelium facilitates movement across the epithelial barrier. In the respiratory tract, the columnar epithelial tissue also has cilia, which are hair-like projections on the outer surfaces of epithelial cells. These cilia can move, and their movement pushes the mucus forward to clear it. This type of epithelium is thus '''ciliated columnar epithelium'''.<br>
http://www.occc.edu/deanderson/dennis-tutorial/dennis-jpeg/Columnar%20Epithelium%20A-2%20copy
http://www.histology.leeds.ac.uk/tissue_types/epithelia/assets/goblet1.gif
'''Simple columnar cells'''
http://www.bio.davidson.edu/people/kabernd/berndcv/lab/epithelialinfoweb/digestivesimplecolumnar.jpg
http://www.bio.davidson.edu/people/kabernd/berndcv/lab/epithelialinfoweb/digestivesimplecolumnar.jpg