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BIOL 1215 (19)
E.Barley (19)


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Langara College
BIOL 1215

Epithelium Simple Epithelium -single cell layer -combining 2 characteristics (arrangements of layer and cell shape) A. Simple squamous epithelium B. Simple cuboidal epithelium C. Simple columnar epithelium (nonciliated and ciliated) D. Pseudostratified columnar epithelium (nonciliated and cilated) A. Simple squamous epithelium DESCRIPTION: Single layer of flat cells that resembles a tiled floor on the surface; Nucleus is centrally located and appears flattened oval or sphere. LOCATION : Endothelium-The type of simple squamous that lines the heart, blood vessels, and lymphatic vessels Mesothelium-The type of epithelial layer of serous membranes such as the pericardium, pleura, or peritoneum -both endothelium and mesothelium are derived from embryonic mesoderm FUNCTION: filtration (blood filtration in kidneys), diffusion, osmosis, and secretion in serous membrane. B. Simple cuboidal epithelium DESCRIPTION-single layer of cube-shaped cells; Cell nuclei round and centrally located. LOCATION-thyroid gland, kidneys. FUNCTION-in secretion and absorption C. Simple columnar epithelium DESCRIPTION- - simgle layer, much taller than they are wide, like columns; Oval nuclei at near base Consist of 2 forms: Nonciliated and ciliated 1. Nonciliated simple columnar epithelium DESCRIPTION – single layer of nonciliated column-like cells with nulcei near base of cells; contains microvilli at their apical surface and goblet cells LOCATION- secreted mucus serves as lubricant for the lining of digestive, respiratory, reproductive and urinary tracts FUNCTION- Absorption and secretion, also prevents the destruction of the stomach lining by acidic gastric juices 2. Ciliated simple columnar epithelium DESCRIPTION-single layer of ciliated column-like cells with nuclei near base; contains cilia at apical surface and goblet cells. LOCATION- In respiratory tract-secreted mucus on the surface traps inhaled foreign particles. Beating cilia moves particles to the throat for removal by coughing, swallowing, or sneezing Cilia also moves oocytes to the uterine tubes FUNCTION- Filtration, diffusion, osmosis, and secretion in serous membrane D. Pseudostratified columnar epithelium DESCRIPTION- single cell layer but appears to have several layers due to nuclei are various depths All cells are attached to the basement membrane in a single laye
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