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what are the six levels of organisation?
chemicals cell tissue organ organ systems organism
what are the type of tissues?
epithelial connective muscle nervous
what are the general characteristics of epithelial tissues?
free surface basement membrane no blood vessels
what are the functions of epithelial tissues? (HINT: 5)
protect underlying tissues barrier to entry of substances permit passage of certain substances absorb substances secrete substances
what is simple squamous epithelial tissues?
1 layer flat cells
what is the function of simple squamous epithelial tissues?
regulate permeability diffusion filtration
what is simple cuboidal epithelial tissues?
1 layer cube shaped cells
what is the function of simple cuboidal epithelial tissues?
absorption secretion
what is simple columnar epithelial tissues?
1 layer tall thin cells
what is the function of simple columnar epithelial tissues?
absorption secretion
what is transitional epithelial tissues?
number of cell layers decrease when stretched
what is the function of transitional epithelial tissues?
stretches to accommodate the change in urine volume
what is pseudostratified columnar epithelial tissues?
1 layer with varying heights of tall thin cells
what is the function of pseudostratified columnar epithelial tissues?
secrete mucus propel mucus out of the respiratory tract
what is stratified squamous epithelial tissues?
more than 1 layer of flat cells
what is the function of stratified squamous epithelial tissues?
protect against abrasion and infection