Epithelial Tissue
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| Cuboidal Epithelium | Dice shaped cells, specialized for secretion. Makes up the epithelium of kidneytubules and many glands including the thyroid and salivary glands.
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| Simple Columnar Epithelium | Shaped like bricks standing on end. Lines the intestines and secretes digestive juices and absorbs nutrients.
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| Pseudostratified Ciliated Columnous Epithelium | This is a single layer of cells varying in height. Forms a mucous membrane that lines portions of the respiratory tract of many vertebrates. The beating cilia move the film of mucous along the surface.
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| Stratified Squamous Epithelium | Multiple layers of tile-shaped cells. Regenerates rapidly by cell division near the basal lamina. New cells are pushed outward, replacing cells that are sloughed off. Commonly found on surfaces subject to abrasion eg. outer esophagus, anus and vagina
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| Simple Squamous Epithelium | Thin and leaky. Functions in the exchange of materials by diffusion. Lines the blood vessels and air sacs of lungs where diffusion of nutrients and gasses is critical.
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| Epithelia are polarized, meaning: | they have two different sides (Apical and basal)
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| Apical Surface | faces the luman (cavity) or outside of organ and is therefore exposed to fluid or air. Often covered with specialized projections eg. microvilli
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| Basal Surface | The opposite side of the epithelium to the apical surface. Attached to the basal lamina.
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| Basal Lamina | A dense mat of extracellular matrix which sepreates the epithelium from the underlying tissue.
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