Histology List Flashcards
Lab 7 tissues stuff
4 human tissue types
- connective
- muscle
- epithelial
- nervous
basement membrane
anchor cells; membrane cells are attached to
major function of nervous tissue ?
communication between cells by neurons
major function of muscle tissue ?
contraction to produce movement
major function of epithelial tissue ?
provide protection, absorption / secretion
major function of connective tissue ?
wide array of function
- support / structure / protection
- transportation / storage
- insulation
- etc.
what cell slides will only show that specific cell instead of multiple kinds of cells ? (3)
- cardiac muscle
- smooth muscle
- adipose connective tissue
3 general types of epithelial tissue shapes ?
- squamous (flat)
- cuboidal (dice)
- columnar (brick)
where is epithelial tissue generally found ?
covering body surfaces, lining internal organs / body cavities
simple tissue means ?
single layer of cells
stratified tissue means ?
2 or more layers of cells
psuedostratified tissue means ?
cells look stratified but are actually all attached to basement membrane
simple squamous epithelium
single layer of flattened cells
- obvious nuclei
function / location of simple squamous epithelium ?
easily diffuse / filtrate materials across cells quickly;
- lining of lungs, kidneys, blood vessels
- general lining of body cavities
simple cuboidal epithelium
single layer of cube shaped cells
- large ROUND nucleus
- lots of cytoplasm
(can appear columnar, pay attention to nucleus shape)
function / location of simple cuboidal epithelium ?
secretion / absorption of substances
- kidney tubules
- ducts and glands (thyroid, salivary, etc.)
- ovaries
simple columnar epithelium
single layer of rectangular cells
- large OVAL nucleus
- lots of cytoplasm
- some have cilia / goblet cells (secretion cells)
function / location of simple columnar epithelium ?
secretion / absorption (mucus, etc.)
- non-ciliated; digestive tract, gallbladder
- ciliated; bronchi, female reproductive system
stratified squamous epithelium
thick basement membrane of cuboidal / columnar that became squamous at TOP layer
- keratinized; layer of keratin, dry lining
- non-keratinized; no layer of keratin, moist linings
function / location of keratinized stratified squamous epithelium ?
protect underlying tissue from abrasion
- epidermis of surfaces experiencing frequent friction ( palms of hands, soles of feet, etc.)
function / location of non-keratinized stratified squamous epithelium ?
protect underlying tissue from abrasion
- esophagus
- mouth / tongue
- vagina
ciliated pseudo-stratified columnar epithelium
single layer of columnar cells that vary in height w/ cilia ; mimic stratification
function / location of ciliated pseudo-stratified columnar epithelium ?
secretion of mucus in respiratory system, etc.
- trachea / upper respiratory tract
- male reproductive system
effects of smoking on cilia ?
chemicals in cigarettes destroy cilia int he upper respiratory tract
- leads to “smokers cough”
- unable to push out mucus / debris automatically
7 types of connective tissue ?
cells scattered throughout protein matrix
- loose areolar
- dense regular
- dense irregular
- loose adipose
- hyaline cartilage
- compact bone
- blood
loose areolar connective tissue
matrix is loose weave of fiber in watery fluid; binds tissues together, stretchy
3 types of loose areolar connective tissue ?
- fibroblasts (make gel-like matrix for tissues)
- collagen fibers (strong, rope-ish protein)
- elastic fibers (stretchy / strong)
functions / locations of loose areolar connective tissue ?
wraps / cushions organs, holds underlying tissue / organs in place
- under skin
- surfaces that line internal cavity
elastic fiber characteristics (loose areolar connective tissue) ?
thin hair-like fibers usually stained darker
- provide elasticity