Tissues Flashcards
a group of similar cells and cell products working together to perform a specific role in an organ.
tissue
structure with discrete boundaries that is composed of two or more tissue types.
organ
what are the four broad categories of tissues
- Epithelial tissue
- Connective tissue
- Nervous tissue
- Muscular tissue
how do the categories of tissues differ from each other
- Types and functions of their cells
- Characteristics of the matrix
- Relative amount of space occupied by
cells versus matrix
extracellular material
matrix
what is the matrix composed of
fibrous proteins
ground substance
what is ground substance
clear gel
what are examples of ground substance
tissue fluid
extracellular fluid (ECF)
interstitial fluid
tissue gel
what are the three primary germ layers
ectoderm
endoderm
mesoderm
A fertilized egg becomes an embryo with layers
embryonic tissues
what is the outer layer
ectoderm
what is the middle layer
mesoderm
what is the inner layer
endoderm
what does the ectoderm give rise to
the epidermis and nervous system
what does the endoderm give rise to
mucous membrane lining digestive respiratory tracts
digestive glands
what does the mesoderm give rise to
cartilage
bone
blood
what does the mesoderm become
mesenchyme made up of wispy
collagen fibers and fibroblasts in gel matrix
Tissue cut on its long axis
Longitudinal section (l.s.)
Tissue cut perpendicular to long axis of
organ
Cross section (c.s. or x.s.)
or
transverse section (t.s.)
Tissue cut at angle between cross and
longitudinal sections
Oblique section
tissue is rubbed across a slide
smear
some membranes and cobwebby tissues are laid out on a slide
spread
does not have blood vessels
avascular
does the epithelial tissue have blood vessels?
np
layer between an epithelium and underlying connective tissue
basement membrane
what does the basement membrane do
Anchors the epithelium to the connective tissue below it
what are the three surfaces of the Epithelial Tissue
basal surface
apical surface
lateral surface
cell surface between the basal and apical
surface, “sidewall”
Lateral Surface
cell surface facing the basement membrane
basal surface
cell surface that faces away from the basement membrane
apical surface
what are the functions of the epithelial tissue
protect
produce and release secretions
excrete
absorb
filter
sense
how is epithelial tissue classified
- Layers of cells
- Shape of cells
Contain one layer of cells with all cells touching the basement membrane.
Simple epithelia
Contain more than one layer with some cells resting on top of others and do not all touch basement membrane.
Stratified epithelia
Flat of squished cells with nucleus that are wider than they are long
squamous
Square or cube shaped cells with nucleus that are round or circle in shape
Cuboidal
Rectangle or column shaped cells with nucleus that are longer than they are wide.
Columnar
falsely appears stratified, as some cells
taller than others. Every cell reaches the basement membrane (but not all cells reach the free surface).
Pseudostratified columnar
wineglass-shaped mucus-secreting cells in simple columnar and pseudostratified epithelia.
goblet cells
what are the functions of Simple squamous epithelium
Permits rapid diffusion or transport of
substances. Secretes serous fluid.
what are the locations of Simple squamous epithelium
alveoli
glomeruli
endothelium
serosa
what are the functions of Simple cuboidal epithelium
Absorption and secretion
mucus production and movement
what are the locations of Simple cuboidal epithelium
liver
thyroid
mammary
salivary glands
bronchioles
kidney tubules
what are the functions of Simple columnar epithelium
absorption and secretion specifically of mucus
what are the locations of Simple columnar epithelium
lining of GI tract
uterus
kidney
uterine tubes
what are the functions of Pseudostratified ciliated columnar epithelium
Secretes and propels mucus.
what are the locations of Pseudostratified ciliated columnar epithelium
respiratory tract
portions of male urethra
where are keratinized tissue found
stratified squamous epithelia
is most widespread epithelium in the body
stratified squamous
what are the functions of Keratinized stratified squamous epithelium
resists abrasion
retards water lose form skin
resists penetration of pathogens
what are the locations of Keratinized stratified squamous epithelium
epidermis
palms and soles
what are the functions of Non- Keratinized stratified squamous epithelium
Resists abrasion and penetration of pathogens
what are the locations of Non- Keratinized stratified squamous epithelium
tongue
oral mucosa
esophagus
vagina
what are the functions of stratified cuboidal epithelium
Secretes sweat
produces sperm and ovarian hormones
what are the Locations of stratified cuboidal epithelium
sweat gland ducts
salivary glands
ovarian follicles
what are the functions of stratified columnar epithelium
aids in protection
what are the location of stratified columnar epithelium
Epiglottis
anus
mammary glands
salivary gland ducts
urethra and small areas of the pharynx
what are the functions of urothelium transitional epithelium
Allow for expansion without distortion. Allows for filling of urinary tract