Anatomy and Physiology Lecture Notes.docx

Secretory products whole cells sebaceous glands page

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-Secretory Products -Whole cells -Sebaceous glands *Page 161 Connective Tissue -Most abundant type of tissue -Functions: -Bind structures -Provide support and protection -Serve as frameworks -Fill spaces -Store fat -Produce blood cells -Protect against infections -Help repair tissue damage -Have an extracellular matrix made of protein fibers and ground substance Connective Cell Types Fibroblasts -Fixed cells -Most common cell -Large, star shaped -Produce fibers Mast Cells -Fixed cell -Releases heparin (blood clotting)
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-Releases histamine Macrophages -Wandering cell -Phagocytic -Important in immunity and prevention of infection Connective Tissue Fibers Collagenous Fibers -Thick -Composed of collagen -Great tensile strength -Abundant in dense CT -Hold structures together -Appear white in abundance Elastic Fibers -Bundles of microfibrils embedded in elastin -Fibers branch -Elastic -Appear yellow in abundance -Vocal cords Reticular Fibers -Thin collagenous fibers -Highly branched -Form delicate supportive networks
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Connective Tissue Connective tissue proper: - Areolar -mainly fibroblasts -gel like ground substance -collagenous fibers -elastic fibers -binds skin to structures -beneath most epithelia -blood vessels nourish nearby epithelial cells -Adipose (fat) -adipocytes -cushions -insulates -stores fat -beneath skin -behind eyeballs -around kidneys and heart -between muscles - Reticular -composed of reticular fibers -supports internal organ walls -walls of liver, spleen Dense Connective Tissue - Dense regular -closely packed collagenous fibers -elastic fibers
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-fibroblasts -very strong -binds body parts together -tendons, ligaments, dermis -poor blood supply; slow to heal - Dense irregular -randomly organized, thick, interwoven collagenous fibers -dermis of the skin -around skeletal muscle - Elastic -abundant in elastic fibers -some collagenous fibers -fibroblasts -attachments between bones -walls of large arteries, airways, heart
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  • Fall '10
  • timdaniels
  • cells, Collagenous Fibers

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