chapter 2 video Flashcards
tissues are made of
cells and extracellulcar material
cells can be connected to each other with
junctions and extracellular matrix
tissues surrounded by
exytacellular matrix
study of tissues
histology
4 types of tissues
epithelial, connective, muscle, nervous
epithelium is refered to as
epithelial tissue
epithelial tissue is composed of one or more layers that are ____
closely packed
epithelieum contains little to no
extracellular matrix
epithelium is connected by
tight junction
lots of ____ associated with epithelium
glands
examples of epithelium
mouth and skin
epithlial cells have _______- surface
apical and basal
apical surface
exposed to external environment or internal body space
epithelial tissue composed entirely of
tightly pacled cells
apical surface could have
microvili or cilia
bsal surface is attached to
connective tissue
basement membrane
Barrier between epithelium and connective tissue
epithelia is Avascularity
means having no blood cells
since epithelia lack blood vessels where do they get nutrients
Nutrients obtained across apical surface or from basal
surface
epithelia have Extensive innervation
Richly innervated; detect changes in environment
epithelia have High regeneration capacity which means they
Continual replacement of lost cells
simple epithelium
One cell layer thick; all cells contact basement membrane
* Filtration, absorption, or secretion is primary function
stratified epithelium
Two or more layers of epithelial cells
* Only basal layer in contact with basement membrane
* In areas subjected to mechanical stress
squamos
Flat, wide, irregular in shape
* Nucleus flat
psuedo stratified
Appears layered
* All cells contact basement membrane, but may not reach apical
surface
columnar
Slender and taller than they are wide
*Nucleus oval; oriented lengthwise in basal region
cuboidal cells
type of epithelial cell that are About as tall as they are wide and their Nucleus is spherical and in center of cel
transitional cells can change _____ depending on stretch of epithelium
shape
simple squamos is the
Thinnest barrier
simple squamos allows
rapid movement of molecules across surface
Simple Cuboidal Epithelium
Designed for absorption and secretion
* Ideal for structural components of glands
Simple Columnar Epithelium
Oval nucleus, lengthwise in basal region
Ideal for secretory and absorptive functions
Two forms:
* Nonciliated
* Ciliated
Ciliated Pseudostratified Columnar Epithelium
Contains cilia on apical surface
Protective functions
Goblet cells secrete mucin
* Traps foreign particles moved by cilia
Located in large passageways of
Stratified Squamous Epithelium
Basal layers with cuboidal shape
Apical cells with squamous shape
Protects against abrasion and friction
Stem cells in basal layer continuously divide
* Replace lost cells at surface
Exists in keratinized and nonkeratinized forms
transitional epithelium are
epithelium that change. changes if they are relaxed
glands are
Individual cells or multicellular organs composed of epithelial tissue
the 2 types of glands are
Endocrine or exocrine
Endocrine glands lack
ducts
endocrine glands secrete _____ into ____
hormones into the blood
Exocrine glands
Invaginated epithelium in connective tissue
invaginated
turn in on itself to form ppouch
exocrine glands are connected with______ by _____
epithelial surface, duct
epithelial lined tube is for
gland secretion
