Lecture Exam 1 (histology) Flashcards
What are the four primary tissue types?
epithelial, connective, neural, and muscle
What is spray paint?
epithelial tissue. lines the inner and outer cavities of body
Epithelial main characteristics
high cellularity, avascular, rapid regeneration
very densely packed cells and very little extracellular material
high cellularity
no direct blood supply.
avascular
due to high mitotic rates, and existence of mesenchymal cells
rapid regeneration
functions of epithelial
physical protection, provide sensation, control permeability
not highly protective, specialized to allow diffusion and permeability, lining of internal compartments and passageways such as blood vessels, lining of the intestines and gas-exchange surfaces of the lungs
simple epithelium
several layers of cells, found in areas subjected to mechanical and chemical stress
stratified epithelium
thin flat cell on exposed surface
squamous epithelia
most delicate epithelium. found in areas where slick surface reduces friction and very thin lining is needed for gas exchange.
simple squamous epithelium
lining of heart and blood vessels
endothelium
lung membranes
pleura
heart membranes
pericardium
abdominal cavity membranes
peritoneum
many cell layers thick found in areas most subject to mechanical and physical stress
stratified squamous epithelium
stratified squamous epithelium located?
surface of skin, linings of mouth, throat, esophagus, rectum, vagina, and anus
contain cells that are hexagonal, nuclei near center.
cuboid epithelia
limited protection, have absorptive and secretory capabilities
simple cuboid epithelium
where simple cuboid epithelium located?
kidney tubes, pancreas, salivary glands and thyroid follicles.
rare epithelial usually found in lining of largest ducts of a gland
stratified cuboid epithelium
column cells. nuclei usually found near the basal surface
columnar epithelia
good protection and absorptive
simple columnar epithelium
simple columnar epithelium located?
stomach, intestinal tract, uterine tubes, and excretory duct
specialized columnar epithelium with many cell types
pseudostratified columnar epithelium
pseudostratified columnar epithelium located?
upper respiratory passages and male reproductive tract
rare epithelia found in throat, urethra, anus and some excretory ducts
stratified columnar epithelium
stratified epithelium that stretches and changes shape. found in pelvis, ureters, and urinary bladder
transitional epithelia
never exposed to surface: epithelial or connective
connective tissue
connective tissue main components
special cells, protein fibers, ground substance
what is matrix
ground substance and protein fibers
3 types of CT
proper, fluid, and supporting
CT Proper
specialized cells and fibers in syrupy ground substance
fluid CT
specialized cells in fluid ground substance. Blood and Lymph
Supporting CT
on special cell in solid ground substance. Bone and Cartilage
cells that are stationary and help with local maintenance of CT
fixed cells
cells that move from one tissue to another searching for damaged tissue and pathogens
wandering cells
cells responsible for the production of fibers and ground substance in CT
Fibroblasts (fixed)
large cells that eat damaged tissue or pathogens
fixed macrophages
energy storage cells. contain large lipid vacuole.
adipocytes (fixed)
stem cells that become any other cell
mesenchymal cells (fixed)
cells that produce a dark pigment called melanin
melanocytes (fixed)
search for damaged tissue and pathogens
ameboid cells (wandering)
large phagocytic cells, called monocytes when in blood stream
free macrophages (wandering)
found near blood vessels. produce and release histamine and heparin in response to injury
mast cells (wandering)
causes increased blood flow and attracts free macrophages
histamine
prevents excessive blood clotting
heparin
small blood cells that travel the body to fight off infection
lymphocytes
activated type of lymphocyte that releases antibodies that assist in fighting off pathogens
plasma cells
smaller versions of macrophages
microphages
CT fibers
collagen, reticular, and elastic
strongest fiber, flexible but wont stretch. very long, cylindrical fibers made up of three subunits coiled around one another
collagen fibers
bands of collagen that connect muscles to bones
tendons
bands of collagen that connect bones to each other
ligaments
single strand of collagen proteins. spleen and liver. stretches in all directions die to branching.
reticular fibers
contain protein elastin. stretch up to 150% of length and bounce back
elastic fibers
abundance of elastic fibers. support vertebral column
elastic ligaments
colorless mixture of water, hyaluronan, proteoglycans, and glycoproteins
ground substance
high amount of ground substance
loose CT
found under all epithelia in the body. mostly ground substance. separates skin from underlying structures.
areolar tissue
adipocytes make up most volume. cushions shock, stores energy, and insulates body from heat loss.
adipose tissue
made mostly of reticular fibers and more macrophages. bone marrow, spleen, liver, and lymph nodes
reticular tissue
low ground substance lots of protein fibers
dense CT
tightly packed collagen fibers aligned parralel to applied forces. tendons, aponeuroses, elastic tissue, ligaments
dense regular CT
mostly collagen fibers arranged in a meshwork.
dense irregular CT
few cells, high amounts of fiber and the ground substance may contain insoluble calcium salts
supporting CT
contains matrix similar to firm gel
cartilage
grows from the surface
appositional growth
grow from the inside
interstitial growth
3 types of cartilage
hyaline, elastic, fibrocartilage
tough, flexible, and weak. most common type of cartilage. costal, respiratory, and articular
hyaline cartilage
cartilage between ribs and sternum
costal
cartilage along the conducting portion of the respiratory tract
respiratory
cartilage covering the ends of bones in joints
articular
strongest of cartilages. little ground substance and abundance of collagen fibers. resist compression, absorb shock, and prevent bone to bone damage. between vertebrae, between bones of pelvis, and a few joints
fibrocartilage
two layered covering of bone tissue
periosteum
epithelia and connective tissues combine to form?
membranes
4 types of membranes
mucous, serous, cutaneous, and synovial
wet membranes that line passageways with connection to exterior
mucous membrane
line ventral body cavity, no connection to exterior
serous membrane
thick, dry, water-resistant membrane that covers the entire surface of body
cutaneous membrane
found inside of capsule surrounding areas where bone contact one another; joints or articulations
synovial membranes
produce synovial fluid
secretory cells
functions of synovial fluid
lubrication of joint, distribution of oxygen and nutrients, cushioning shock.