Tissues Flashcards
(81 cards)
what are the four primary types of tissue in the human body?
connective
epithelium
muscle
nervous
define tissues
group of cells with similar structure and function
where can you find epithelium tissue?
body linings and coverings
glandular tissue
functions of the epithelium
secretion
absorption
filtration
protection
how are epithelium classified?
number of layers (first name) and shape of the cell (last name)
squamous
flat squished cells with a flat nucleus
allows for materials like oxygen to easily move across
fast absorption and diffusion
cuboidal
cube like cells
circular nucleus
absorption of nutrients and secretion
columnar
tall thick cells
ellipse nucelli
absorbs nutrients and produce secretions
simple
one layer
stratified
more than one layer
avascular
no blood supply
how does the epithelium get the materials they need?
from the connective tissues surrounding them
characteristics of epithelium
cells fit close together and form sheets
selective permeability
regenerate if well nourished
appical
upper side of tissue
located outside body or whatever internal cavity it is lining
basal
rests on basements membrane
inner side of tissue
simple epithelia
forms membranes that line body cavities
lines lungs and capillaries
simple cuboidal
common in glands and ducts
forms walls of kidney tubules
covers the ovaries
simple columnar
lines digestive tract
includes mucus producing goblet cells
pseudostratified columnar epithelium
single layer with some shorter cells
may be ciliated in the respiratory tract
may function in absorption of secretion
stratified squamous
protective covering where friction is common
located in the skin, mouth and esophagus
transitional epithelium
shape of cells depends on amount of stretching
lines organs of the urinary system
glandular epithelium
endocrine gland (secretes hormones, ductless bc secretions diffuse into blood vessel) and exocrine glands (secrete sweat and oil, secretions empty through ducts to the epithelial surface)
gland
organ specialized in secreting substances
epithelium
primary tissue
covers the surface of the body and lines body cavities, ducts and vessels