tissue Flashcards
a group of cells with similar structure and function, along with the extracellular substances located between the cells.
tissue
the study of tissues.
histology
covers surfaces; it usually has a basement membrane, little extracellular material, and no blood vessels.
epithelial tissue
include protecting underlying structures.
acting as a barrier,
permitting the passage of substances
secreting substances,
and absorbing substances.
epithelial
classified according to the number of cell layers and the shape of the cells.
epithelia
has one layer of cells, whereas stratified epithelium has more than one.
involved with diffusion, secretion, or absorption.
simple epithelium
simple epithelium that appears to have two or more cell layers.
pseudostratified columnar epithelium
stratified epithelium that can be greatly
stretched.
Transitional epithelium
serves a protective role.
stratified epithelium
function in diffusion or filtration.
squamous cell
which contain more organelles, secrete or absorb.
cuboidal or columnar cells
free surface reduces friction.
smooth
increase surface area, and cilia move materials over the cell surface.
microvilli
bind adjacent cells together and form a permeability barrier.
tight junctions
bind cells together
desmosomes mechanically
allow intercellular communication.
gap junctions
bind cells to the basement membrane.
hemidesmosomes mechanically
single cell or a multicellular structure that secretes.
gland
have ducts, and endocrine glands do not.
exocrine glands
distinguished by its extracellular matrix.
enclose and separate organs and tissues;
connect tissues to one another;
help support and move body parts;
store compounds;
cushion and insulate the body;
transport substances;
protect against toxins and injury.
commonly contains adipocytes, mast cells, white blood cells, macrophages, and mesenchymal cells (stem cells).
connective tissue
results from the activity of specialized connective tissue cells; in general, -blast cells form the matrix, -cyte cells maintain it, and -clast cells break it down.
extracellular matrix
form protein fibers of many connective tissues, osteoblasts form bone, and chondroblasts form cartilage.
fibroblast
joined to form collagen fibers.
resemble ropes.
They are strong and flexible but resist stretching
collagen fibers
joined to form collagen fibers.
resemble ropes.
They are strong and flexible but resist stretching
collagen fibers