Tissues Flashcards
(34 cards)
- single layer of flat cells
- substances can pass through easily
- line blood vessels
- line lymphatic vessels
- line air sacs
simple squamous
-single layer of cube shaped cells
- line kidney tubules
- cover ovaries
- line ducts of some glands
simple cuboidal
-single layer of elongated cells
- nucleus near basement (so is membrane)
- sometimes have cilia and microvilli
- line uterus, stomach, and intestines
simple columnar
-single layer of elongated cells
- nuclei at two or more levels
- often have cilia and goblet cells (secretor of mucus)
- line respiratory passages (trachea)
Pseudostratified columnar
-many cell layers
- top cells are flat
- can accumulate keratin
- outer layer of skin
- lines oral cavity, vagina, and anal canal
stratified squamous
-many cell layers
- cube shaped and elongated cells
- line urinary bladder, uterus, and part of the urethra
transitional
composed of cells that are specialized to produce and secrete substances
glandular epithelium
are ductless
endocrine glands
contain ducts
exocrine glands
example of unicellular exocrine gland (composed of one cell)
goblet cell
examples of multicellular exocrine gland (composed of many cells)
sweat glands, salivary glands, etc
fluid product, salivary glands, pancreas gland, sweat gland
merocrine glands
cellular product, portions of cells, mammary glands, ceruminous glands
apocrine glands
secretory products, whole cells, sebaceous glands (oil)
holocrine glands
fixed cell, produce fibers, most common cell, large star shaped
fibroblast
wandering cell, phagocytic, important in injury or infection
macrophage
fixed cell, release heparin and histamine
mast cells
thick, hold structures together, tendons and ligaments, composed of collagen, great tensile strength, abundant in dense CT
collagenous fibers
very thin collagenous fibers, highly branched, form supportive networks
reticular fibers
bundles of microfibrils, vocal cords and air passages, embedded in elastin, fibers branch, elastic
elastic fibers
mainly fibroblast, fluid to gel like matrix, collagenous fibers, elastic fibers, bind skin to structures, beneath most epithelia, blood vessels nourish nearby epithelial cells, between muscles
loose connective tissue
behind eyeballs, around kidneys and heart, cushions, insulates, store fats, beneath skin, adipocytes
adipose tissue
composed of reticular fibers, supports internal organ walls, walls of liver, spleen, lymphatic organs
reticular connective tissue
packed collagenous fibers, elastic fibers, few fibroblasts, bind body parts together, tendons, ligaments, dermis, poor blood supply
dense connective tissue