chapter 4 part 3 epithelium Flashcards
connective tissue
protect, support and bind organs
-RBC, WBC and platelets included
fat
conenctive tissue that stores energy
tissue development
4 tissue develop from the three primary germ layers
epithgelial tissue
forms from all 3 germ layers
-have free apical surface and an attached basal surface
connective tissue and muscular tissue
form from mesoderm
nervous tissue
form from ectoderm
epithelial basal layer
secretes the basal lamina
basal lamina
underlying connective tissue that secretes the reticular lamina
-both basal and reticular lamina form a noncellular basement membrane on which the epithelium sits
naming epithelium
-always names based on the shape of cell in the apical (outermost) layer
serous membrane
-made of simple squamous epithelium
-lines inner walls of body cavities
-secrete serous fluid for lubrication and movement
simple cuboidal
-lines kidneys and glands
goblet cells
-columnar cells that have differentiated to be able to secrete mucous
-simple columnar
-in ciliated tissue
statified squamous
-has apical surface made of flat cells
-the many layers protect against strong friction forces
-outer layer of the skin
stratified cuboidal
-has apical surface
-2 or more layers of cells
-sweat glands and urethra
-1 layer would not be enough for the functions it does
stratified columnar
very rare
transitional
-has an apical surface
-not stretched= empty bladder
-flat cells= full bladder
pseudostratified ciliated
upper respiratory tract
endothelium
specialized simple squamous epithelium that lines the entire circilatory system and makes blood flow easy
-from mesoderm (middle layer)
mesothelium
found in serous membranes like the pericardium, pleura and peritoneum
-from mesoderm (middle layer)
endothelium and mesothelium
-the only epithelial tissue from the third germ layer
extracellular matrix
help cells attach and communicate with one another
-affects cell growth, movement, and repairs damaged tissues
-it is secreted by cells/ surrounds them in tissue
-secretions specific to tissue
molecules that make up the extracellular matrix
-adhesive proteins, structural proteins and proteoglycans
-can also have fibers, salts, water and dissolved macromolecules
functions of epithelia
-passage of substances at cells lining the air sacs in the lungs and the nephrons in the kidney
-secreting substances in the pancreases
-absorbing in digestion
stratified epithelium
-regenerate from below
-all about protection
-named based on the shape of the cell at the apical layer
stratified squamouos
-the deep layers of the cells may appear cuboidal or columnar
-the ticket epithelial tissue for protection
-keratinized (protective protein) is for the epidermis
non keratinized statified squamous
forms the moist lining of body organs (esophagus, mouth, vagina)
gland
one or more cells that make and secrete an aqueous fluid
-2 types
-endocrine and exocrine
endocrine glands
have no contact with the exterior body and produce hormones
how are exocrine glands classified?
by their structure or method of secretion
goblet cells are?
unicellular exocrine glands
examples of multicellular glands?
-sweat, oil, pituitary and adrenal glands
simple exocrine glands
ducts with few branches
pancrease/ compound gland
compound exocrine gland that has ducts that end in tubiles or sac like structures
aveoli/ compound gland
ducts end in simple sacs
lateral surface features
-tight junctions, desmosomes and gap junctions
