cells that have protective and secretory functions. covers all organs and body systems
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features of epitheilium (4)
cohesive sheet,high regeneration,base membrane to attach epithelium to connective tissue, free apical surfaces.
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3 types of cell arrangemnet?describe
simple-one cell thick. stratified-many cell thick, only bottom layer in contact with basement membrane. pseudostratified-appear more than 1 cell thick but all cells in contact with basement membrane
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types of simple and exampls of where to find/function
squamous-diffusion. columnar-absorbtion role. cubodial. transitional-shape can stretch and change, urinary tract.
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types of stratified and examples/function
cubodial and squamous- protection. keratinised squamous-skin and nails.columnar- absorbtion
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pseudostratified function and examples
una have cillia , ie in trachae/lungs
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basal surface adaptions
basement membrane-filter
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apical surface adaptions 2
microvilli and cilllia
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lateral surface adaptions 3
junctions= adhesion-adhsevive spots. tight-membranes fuse, no pass. gap -small mols pass
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exocrine gland
secretion on surface . multicellular use ducts
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endocrine gland
secretion directly into blood
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3 secretory mechanisms
merocrine, holocrine, apocrine
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merocrine description
secretion pasees without damage to membrane eg exocytisis
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holocrine descripton
part of cell containing substance breaks off. cell dies
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