lecture notes 4-6 Flashcards
what are the four tissue types
epithelial
connective
muscle
nervous
what are tissues
collection of specialized ells and extracellular substance
what is tissue classification based on
structure of cells composition of extracellular matrix function of cells.
what are the four primary tissue types
epithelial
connective
muslce
nervous
what is histology
microscopic study of tissues
what is a biopsy
used for diagnostic purposes
what is an autopsy
examination of organs to determine cause of death or to study the changes caused by disease.
what is characteristics of epithelium tissue
almost entirely cells
covers body surfaces and forms glands (outside-skin ; lining inside-digestive tract)
most have a free, lateral and basal surface
basement membrane
avascular
capable of regeneration.
what is basement membrane
an extracellular material formed by secretions from epithelial and connective tissue called glue.
what is three puposes of basement membrane.
helps attach epithelial cells to underlying tissues
guides cell migration fro tissue repair
filter-nephron of kidney.
what determines function of epithelial tissues
layers and shapes
what is function of epithelial tissues
barrier, diffusion, filtration, secretion, absorption, protection.
what are the three components a free surface of epithelial cel can have
smooth
microvilli
cilia
what is purpose of microvilli
increase surface
what is purpose of cilia
move materials across cell surface.
what are the three classifiecations of epithelium cells based on layers of cells
simple
stratified
pseudostratified
what is pseudostratified
appears to be stratified, but all cells are attached to basement membrane.
what are three types of cells based on shape of cells
squamous
cuboidal
columnar
where are simple squamous epithelium cells found
lining of blood vessels and the heart. myphatic vessesl, alveoli of the lungs.
what is purpose of simple squamous epithelium cells
diffusion, filtration, some secretion, some protection.
where is simple cuboidal epithelium cells found
some with microvilli in kidney tubules and some line terminal bronchioles of the lungs
what is purpose of simple cuboidal epithelium cells
secretion, absorption.
where is simple columnar epithelium found
GI tract, microvilli, lungs, cilia.
What is purpose of simple columnar epithelium
secretion and absorption in small intestines, particles out
what is two types of stratified squamous epithelium cells
keratinized
nonkeratinized.
where is nonkeratinized cells found
mouth, throat, esophagus.
what does nonkeratinized cells consist of
consists of living cells in the deepest and outermost layers
layer of fluid covers the outermost cells which makes them moist.
where is keratinized cells found
skin
what do nonkeratinized cells consist of
living cells in deepest layer, and teh outer layers are composed of deead cells containing the protein keratin.
what is the purpose of stratified squamous epithelium cells
protection from abrasion, chemicals, water loss, infection.
where is stratified cuboidal epithelium found
sweat gland ducts
what is purpose of stratified cuboidal epithelium
secretion, absorption, protection agaisnt infection.
where is stratified columnar epithelium found
mammary gland duct, larynx, portion of male urethra.
what is purpose of stratified columnar epithelium
secretion, protection.
where is pseudostratified columnar epithelium
nasal sinuses, bronchi of lungs, trachea.
what is purpose of pseudostratified columnar epithelium
secrete mucis, move mucus.
where is transitional epithelium found
lining urinary bladder, ureters
what is purpose of transitional epithelium
stretch with volume changes of organ- protects agaisnt caustic effects or urine.
what is the functions of cell connections
bind cells together
hold cells together and form a permeable layer
intercellular communication
whats desmosomes
bind cells together
what are tight junctions
hold cells together and forms a permeable layer
what aer the types of glands
endocrine
exocrine
what is endocrine
no ducts. hormones to blood stream
what is exocrine
ducts
what are the two ways glands are classiied
type and structure.
what are the two ways of classifying glands according to structure
unicellular- goblet cells
multicellular- classified by the structure of the ducts or by their method of secretion.
what are four types of glands according to structure
simple- ducts with few branches
compound- ducts with many branches
tubular- secretory regions shaped like tubes
acinar- saclike structures
what are types of glands according to secretion
merocrine
apocrine
holocrine
what are merocrine
secretion with no loss of cellular material
what is apocrine
fragments in secretion-cell oinches off
what is holocrine
whole cells is part of secretion
what is function of connective tissue
enclose organs connect tissues- tendons suport and movement- bones, rigid support storage- fat cushion- fat transport- blood protect
what are blasts
create matrix
what are cytes
maintain matrix
what are clasts
breakdown fro remodeling
what are mast cells
reelease in response to injury, trauma, infection.
what are the two types of macrophages
fixed wandering
what are 3 major components of extracellular matrix
protein fibers
ground substance
fluid.
what are the three types of proteins fibers in the extracellular matrix
collagen
reticular
elastic
what is reticular
fine collagen fivers. forms branching network. fill spaces between tissues and organs.
what is ground substance
shapeless background in microscope
what are the four types of ground substance
hyaluronic acid
proteoglycans
adhesive molecules
what is purpose of hyaluronic acid
lubricant for joint cavities
what is purpose of proteoglycans
traps large amounts water. provides cartilege with its resilient nature.
what is purpose of adhesive molecules
holds proteoglycans together.
what makes up extracellular matrix
protein fibers
ground substance
fluid
what are 2 types embryonc connective tissue
mesenchyme
mucous
what are 6 types adult connective tissue
loose dense special properties cartilege bone hemopoietic tissue
what is purpose of loose connective tissue
loose packing material of most oragans and tissues
attaches skin to underlying tissues
what is special about dense regular collagenous connective tissue
has abundant collagen fibers-resists streching
tendons
ligaments
what tissues make up the layers of the skin
epidermis
dermis
hypodermis
what are the two types of adipose tissue
yellow- white at birth, yellows with age because of accumulation of pigments
brown- more found in babies. controls body temp.
what is purpose of reticular tissue
provides a super structure for lymphatic and hemopoietic tissues
space between reticular cells contain WBC’s and dendritic cells
what are two characteristics of cartilege
firmest structure in body except bone
avascular- no blood or nerve supply
what is perichondrchondrium
dense irregular connective tissue that surronds nearly all cartilege. secretes cartilege cells.
what are chondrocytes
cartilege cells surronded by matrix and located in spaces called lucunae.
where is hyaline cartilege found
ribcage, trachea, brincki. embryo skeleton.
what is hyaline cartilege involved in
growth in lenght of bones
what is structure of hyaline cartilege
collagen fibers and proteoglycans in matrix
what is structure of fibrocartilege
thick collagen fibers in matrix. slightly compressible and tough
where is fibrocartilege found
areas of pressure on joints. knee. invertabral disk
what is structure of elastic cartilege
elastic and collagen fibers and proteoglycans in matrix.
where is elastic cartilege found
external ears
what are components of bone
hard connective tisssue
matrix- strenght and rigidity
osteocytes located in lacunae
what are the types of bone
cancellous or spongy
compact bone
what is cancelllous bone
trabeculae of bone with spaces. looks like a sponge. found inside of bone.
where is cancelous bone found
skull, vertebrea, strnum, ends of long bones.
what is compact bone
concentric layers around a central canal
what elemetns does blood form
red cells, white cells, platelets.
what forms hemopoietic tissue
blood cells
where is hemopoietic tissue found
red bone marrow
what are two types of bone marrow
red- red and white cells
yellow-adipose tissue
what is marfan syndrome
genetic condition, affects individuals by targeting the elastic fibers of connective tissue. this causes the connective tissue to be weakened and unable to work.
what are characteristics of muscle tissue
contracts or shortens with force
moves the body;pumps blood
what are types of muscle tissue
skeletal- attached to skeleton
cardiac-straited and involuntary
smooth-muslce of tubular structures and skin. regulates size of organs. nonstraited and involuntary
what do neurons or nerve cells do
produce actin potentials