CH. 5 NOTES: CONNECTIVE TISSUE
CONNECTIVE TISSUE CHARACTERISTICS Variations in blood supply Some tissue types are well vascularized Some have a poor blood supply or are avascular Extracellular matrix Non-living material that surrounds living cells Two main components: Ground substance—mostly water along with adhesion proteins and polysaccharide molecules Fibers – produced by cells
CONNECTIVE TISSUE CHARACTERISTICS Connective Tissue Fibers: Collagenous fibers: Thick, white threads of protein (collagen) that are grouped in long, parallel bundles. Flexible but slightly elastic Great tensile strength, resist pulling force (tendons and ligaments) Elastic Fibers: Thin, yellow fibers of protein (elastin) Weaker than collagen fibers, but stretch easily while able to return to original shape Reticular Fibers: Thin collagenous fibers Highly branched and form support networks in variety of tissues (spleen)
CONNECTIVE TISSUE CHARACTERISTICS Major Cell Types: Fibroblasts – large star-shaped cells produce fibers by secreting proteins Macrophages – (histiocytes) originate as white blood cells, carry out phagocytosis (scavengers, defensive cells that clear foreign particles)
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- Fall '17
- May Crook