The others are Nervous, Muscle, and Connective
Epi- above
thele: teat
-ium indicates biological structure
Simple Epithelium
Filtration, Diffusion, secretion, and absorption
Cuboidal
glands
tubules of the kidney
terminal bronchioles of the lungs
ducts of reproductive tracts
Columnar
line the
gastroins\testinal
tract
secretion
absorption
Absorption: Certain epithelial cells
lining the small intestine absorb
nutrients from the digestion of food.
may have micriovilli
enhance the surface are of the cell
and increase the rate of diffusion of
materials into the cell
Uterus (womb)
pseudostratified
columnar
often have cilia
Cilia are used to move the cell or to move
objects over the surface of the cell with power
strokes
Cleaning: Ciliated epithelium assists in removing
dust particles and foreign bodies which have
entered the air passages.
ducts of reproductive tracts
air condition pathways of the respiratory tract
Diffusion: Simple epithelium promotes the diffusion of gases,
liquids and nutrients. Because they form such a thin lining,
they are ideal for the diffusion of gases (eg. walls of
capillaries and lungs).
fast absorption
Squamous
Heart cavaties
Internal surfaces of all blood and lymph vessels
Reduces Friction: The smooth, tightly-interlocking, epithelial cells
that line the entire circulatory system reduce friction between the
blood and the walls of the blood vessels.
air cells of lung
filtration capsules and thin tubules in the kidney
Excretion: Epithelial tissues in the kidney excrete waste products from
the body and reabsorb needed materials from the urine.
Sweat is also excreted from the body by
epithelial cells in the sweat glands.
major body cavaties
Sensation: Specialised epithelial tissue
containing sensory nerve endings is found in
the skin, eyes, ears, nose and on the tongue.
Stratified Epithelium
resistant to wear and tear because of ready replacement of cells
Squamous
skin
keratin
Anotações:
scleroprotein
protects epithelial cells from damage or stress that has potential to kill the cell
Keratin is a type of filament protein, called
an intermediate filament. The filaments
anchor the cells to each other, which
prevents the cells from pulling apart
protection: protect underlying tissue from
mechanical injury, harmful chemicals,
invading bacteria and from excessive loss of
water
Epidermis
oral cavity
vocal folds
esophagus
Anotações:
pherein "to carry" (see infer) + -phagos, from phagein "to eat" (see -phagous).
vagina
anus
basal layers can be squamous, cuboidal or
columna
Transitional
contracted, bumpy
surface allows
urinary organs to
bend and stretch
bladder
ureters
prostate
Cuboidal
Protects glands
Glandular Epithelium
Secretion: In glands, epithelial tissue is specialised to secrete specific chemical
substances such as enzymes, hormones and lubricating fluids.
Exocrine (out)
retain a duct to the free
surface fo the cavity or
skin