Chapter 4 book Flashcards
what tissues are most diverse in form?
connective and epithelial
true or false: tissue are interdependent
true
what do germ layers do?
give rise to all tissues in the body
what happens 13-14 days after fertilization?
the emboryonic stems cells that give rise to a new individual form a slightly elongated disk consisting og the epibals and hypoblast.
neuroectoderm
becomes the nervous system
neueral crest cells
break of from the neuroectoderm and give rise to peropheal nerves, skin pugment, the medulla of the adrenal gland, and many tissues of the face.
what is the lateral surface for epithelial cells
where they are attached to other epithelial cells
what are the 3 types of epithelial tissue?
simple epithelium, stratified epithelium, pseudostratified columnar epithelium
what are the 3 shapes of epithelial tissue?
cuboidal, columnar, and squamous
where is transitional epithelium found?
urinary bladder, ureter, urethra
nonkeratinized stratified squamous epithelium
moist- have a layer of fluid that covers the outermost layers of cells
found in mouth, esophagus, rectum and vagina
keratinized stratifies squamous epithelium
found in the skin consists of living cells in the deepest layers, and the outer layers are composed of dead cells containing the protein keratin. the dead keratin cells give the tissue a dry, durable, moisture-resistant character.- found in gums and hard palate
transitional cells are located in places that need to
expand and be stretched
what do the cells and layers look like when the bladder is full?
flattened and squamous. layers decrease from 5-6 to 2-3
what connects glycoproteins of each cell together?
desmosomes
when are tight junctions formed?
to prevent passages of materials between cells.
adhesion belt
belowe tight junction and acts as a weak glue to hold cells toggether
gap junction lets
ions and small molecules by
may cordinate the movement of cilia
allow electrical signals between cells