Intro. Video
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Epithelial Tissue = lining or covering of the
body
Function = Protection, absorption, filtration
and secretion.
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fits closely together to form continuous sheets.
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Always have one free surface or edge. (apical)
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Basement membrane = what the lower
surface rests upon (usually connective tissue)
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No blood supply at all. Rely on diffusion!!!
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Regenerate easily.
Simple = one layer
Stratified = more than one layer
 A. Squamous= flattened “scale”
DRAW ONE HERE! 
 b. cuboidal = dice shaped
DRAW ONE HERE! 
c. columnar … DRAW ONE HERE! 
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d. Simple squamous found in lungs
and blood vessels. Easy diffusion!
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Simple cuboidal found in glands and
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Simple cuboidal found in Goblet cells/ digestive system
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Psuedostatified columnar found in the respiratory tract have
cilia.
Statified sqaumous found in areas of friction like the
epidermis and mouth.
Transitional epithleial found in organs that stretch like
urinary bladder.
Glandular = one or more cells that make or secrete a product.
Secretion = protein molecules in a water based fluid MUCUS)
for protection!
Endocrine gland =ductless Exocrine = have ducts
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Function: Protect, support and bind
together, store fat, produce blood cells,
repair and protect against infection.
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a. vary in blood supply and are farther apart
than epithelial.
b. Extracellular matrix can hold more weight
& stretch more.
Collagen = white… resist pulling,
elastic = light yellowish ex. tendons (bone to
muscle) and ligaments (bone to bone)
reticular = very fine fibers ex. = spleen
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Macrophages – eat forgien particles
Mast cells - release proteins that help prevent
blood clots and stop allergic reactions.
Fibroblasts—most common connective tissue,
star shaped and secrete protein into extracellular
matrix.
Loose Connective – flexible
Areolar—most abundant, delicate, thin and
elastic, provides a soft cushion ex. collagen
Adipose - FAT, cushions, insulates and protects
organs.
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Reticular- interwoven like blood cells in spleen
Dense Connective- not so flexible
Cartilage – rigid, protects and attaches
 Most common is hyaline cartilage ex. larynx
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Elastic- ex. ear
Fibrocartilage – very tough ex. discs
btwn.vertebrae
Bone-- most rigid connective tissue, due to
mineral salts
Blood-- transports a variety of materials
through body and external environment.
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Serous-- line the body cavities and lack
opening to outside body, have a watery fluid
that lubricates.
Mucous-- line cavities open to outside the
body. Ex. nose and mouth
Cutaneous—a.k.a. the SKIN
Synovial – lines the joints.
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Function = movement . Consists of long
fibers that contract or shorten.
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Smooth / Involuntary = have no striations
and elongated nuclei. Found in the walls of
organs.
Skeletal = attached to bone. Control
voluntary actions. Have obvious striations
(light and dark cross markings).
Cardiac = found only in the heart. Fit
together closely, each has their own nuclei so
that ions can move quickly and heart can
contract often.
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Function = control body!
Parts include brain, spinal cord and nerves.
Have neuroglial cells that help neurons
communicate.
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Regeneration = replacement of cells.
Ex.
epithelial and connective
Fibrosis = scar tissue. Ex. Muscle &
nervous
**** Scar tissue does not function like the
original tissue!!
Video
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When cells regenerate wildly = neoplasm.
a. Benign = grow slowly ( not harmful)
b. malignant = grow quickly cancerous!
Hyperplasia = increase in # of cells and is
caused by a local irritant
Atrophy = decrease in # of cells if it not used
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Growth through cell division occurs from
conception to puberty.
Cells exposed to friction will continue to
reproduce- like your skin.
Connective tissue remains mitotic.
Heart and nervous tissue becomes amitotic.
(unable to reproduce)
ex. heart attacks
cause scar tissue = can’t contract as well.
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Cause of aging is unknown.
As we age, our muscles weaken, epithelium
becomes thinner, skin loses elasticity and our
exocrine glands dry out!
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BET YOU CAN’T WAIT! Ha Ha!
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