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Tissue
Tissues: similar cells organized to perform a common function.
Four major types:
Epithelial
Connective
Muscular
Nervous
Tissues: epithelial
Polarity: Cells have an exposed apical surface, and are attached on the opposite side on a basal surface.
Attachment: Cells attach on the basal surface to a basement membrane (with a basal lamina and reticular lamina)
Specializations: Many epithelial cells have extensions (processes) on the apical surface to increase surface area for absorption and secretion. These include:
Microvilli: small, finger-like projections
Cilia: longer projections that move substances across the surface
Stereocilia: very long (up to 200 micrometer) that cannot move (like cilia)
Tissues: epithelial
Basement membrane: cells attach basal surface to a basement membrane which is made of two parts.
Basal lamina: secreted by the epithelial cells (glycoproteins, proteoglycans, and fine microfilaments)
Reticular lamina: secreted by the underlying connective tissue (coarse protein fibers)
Tissues: epithelial
3 types of epithelial cell shapes:
squamous
cuboidal
columnar
2 types of layering:
simple (one cell thick)
stratified (2+ cells thick)