function of the connective tissue
binding and supporting , protecting, insulting, storing and reserve fuel and trasporting substances in the body.
3 characteristic of the connective tissue
common origin:all connective tissues arise from mesenchyme (an embryotic tissue)
Degrees of vascularity: connective tissues run the gamut vascularity. Cartillage are avascular
Extracellular matrix: all other primary tissues are composed mainly of cells, but connective tissue are largely nonliving.
extracellular matrix: separates, often widely , the living cells of the tissue.
What is the main elements of the connective tissue?
ground substance,fibers and cells. Together they make up the extracellular matrix.
Ground substance structure
is the unstructured material that fills the space between the cells and contain the fibers. it is composed of interstitial fluid, cell adhesion proteins and proteoglycans.
Cell adhesion proteins structure
Serve mainly as a connective tissue glue that allows connective tissue cells to attach to the matrix
connective tissue fibers structure
Provide support.Tree typer of fibers are found in the connective tissue matrix: collagen, elastic and reticular fiber
are long, thin fibers that form branchs in the extracellular matrix. Are found in the skin, lungs and blood vessels walls.
Primary blast cell types by connective tissue class are:
connective tissu proper :fibrolast
Connective tissue houses other types of cell like: Fat cell (store nutrients)
White blood cells:(neutrophils, eosinophils,lymphocytes. Response to injury
Areolar connective tissue
Functions: supporting and biding other tissues
Holding body fluids
Defending against infection
Storing nutrients as fat in fat cells
when body region is inflamed, the areolar tissue in the area soaks up excess fluids like a sponge and the afected area swells and becomes puffy, an condition called edema
Is simular to areolar tissue in structure and function,but nutrients storing ability is much greater
reticular connective tissue proper:dense connec. reticular
resembles areolar connective tissue , but the only fibers in its matrix are reticular fibers, which form a delicate network along along which fibroblast called reticular cells
Adipose tissue is richly vascularized , indicating activity. without the fat stores in our adipose tissue we could not live for more than a few days without eating.
Reticular connective tissue loose
houses of retiicular fibers in a typical loose ground substance, reticular cells lie on the network
Reticular tissue function:
fibers form a soft internal skeleton(stroma) that supports other cell types including white blood cells , mast cellss an microphages
Dense connective tissue , dense regular(proper)
Primarily parallel collagen fibers , a few elastic fibers, major cell type is the fibroblast.
Dense connec. tissue dense irregular
Primarily irregularly arranged collagen fibers , some elastic fibers, fibroblast is the major cell type
fiber are also organized but in different direction, allowing movements in different directions