3.2 Lab - epithelia - hyperplasia & metaplasia Flashcards
T/F a squamous cell is relatively inactive, metabolically
true
what gives a columnar epithelial cell its columnar shape?
stored product from secretions or absorptions
this epithelial cell type has significant metabolic activity but usually no predominant intracellular organelles other than the nucleus
cuboidal
the cell type in the secretory portion of an eccrine sweat gland
simple columnar
the cell type in the duct of an eccrine sweat gland
stratified cuboidal
(two layers of cuboidal)
(no secretion, just transport)
axillary skin refers to…
underarms
lots of sweat glands
where can eccrine sweat glands be found?
on most of skin
what are the epithelia types in an eccrine sweat gland?
simple columnar (secretory) stratified cuboidal (duct)
what is the 3D shape of an eccrine sweat gland?
a coiled gland with a single duct extending to skin surface
where is stratified columnar epithelium found?
inner surface of eyelid
secretes mucus in tears
where are eccrine sweat glands usually found?
in skin everywhere, usually close to hair follicles
which are the most prominent glands in axillary (underarm) skin?
apocrine sweat glands (larger and deeper, secrete into hair follicle)
-eccrine sweat glands are smaller and more superficial, secrete to skin)
how do eccrine and apocrine sweat glands compare in size?
apocrine sweat glands have much larger lumens
define pseudostratified epithelium
all cells touch basement membrane, but not all touch lumen
how to tell pseudostratified epithelium from simple columnar?
nuclei will appear more stratified
are pesudostratified epithelia usually squamous, columnar, or cuboidal?
various types, will appear mostly columnar, bot only have to label it “pseudostratified epithelium,” nothing more
where are psudostratified epithelia usually found?
conducting portions of respiratory system
(nasal cavity, trachea, bronchi)
often with ciliated and mucosal cells
if you have an epithelia that may be simple columnar, stratified columnar, or pseudostratified, how can you tell which?
if in respiratory system - pseudostratified
if inner eyelid - stratified columnar
other secretory locations - prob simple columnar
an apparently stratified epithelium with a number of layers that changes with stretching is called a…
transitional epithelium
where is transitional epithelium found?
exclusively in urinary system
-spaces exposed to urine (ureter, bladder)
what are umbrella cells specialized for?
confining urine
what kind or epithelia have umbrella cells?
transitional
T/F umbrella cells function in absorption & secretion
false
no apparent absorptive or secretory functions
confine urine
T/F umbrella cells are often multinucleated
true
