epithelial tissue Flashcards
(19 cards)
what is a tissue
groups of cells with a common role
what are the 4 basic types of tissues
epithelial, connective, muscular, nervous
what does epithelial tissue do
covers and lines body surface and cavities
what does connective tissue do
protects and supports
what does muscular tissue do
generates physical force for movement
what does nervous tissue do
coordinates body activities
describe epithelial tissue
continuous sheet where cells are close together
no blood vessels - avascular
have a nerve supply - innervation
high capacity for cell division
name the types of epithelium
simple epithelium
stratified epithelium
describe simple epithelium
1 layer of cells
describe stratified epithelium
more than 1 layer of cells
what are the cell shapes of epithelial cells
squamous
cuboidal
columnar
transitional (change shape)
describe squamous epithelial
single layer of flat cells
what are squamous epithelial cells important for
filtration (kidneys) or diffusion (lungs and capillaries)
what are squamous epithelial cells called when lining the heart, blood and lymphatic cells
endothelium
what are squamous epithelial cells called when in serous (watery) membranes
mesothelium
what are features of simple cuboidal epithelium
cube shaped cells
rounded nuclei
describe structure of stratified squamous epithelium
apical (top) layer of cells are flat
deep layers vary from cuboidal to columnar
how do cells in stratified squamous epithelial divide
cells in the basal layer divide and move upward towards apical surface
where is stratified squamous epithelium found
in areas of surface wear and tear
