Intro to tissue and epithelial tissue

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Intro to tissue and epithelial tissue Powered By Docstoc
					                                           9/22/09




 The  student will become familiar with
  tissues, their structure and function

 The student will become familiar with
  the various types and functions of
  connective tissue throughout the body

 The student will become familiar with
  membranes that are found in various
  parts of the body





 What   are you made of?





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 Chemical    

 Cellular

 Tissue

 Organ

 Organ    system

 Organism





 Chemical    

 Cellular

 Tissue

 Organ

 Organ    system

 Organism





           a group of similar cells
 Definition:
 working together to perform a common
 function


 Histology:      the study of tissue





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1.         Epithelial Tissue:

      •      Covers the body, lines ducts and cavities and
             forms glands (secreting cells)

      •      Thin, allow for things to pass through

2.         Connective Tissue

      •      Connects, supports, and binds the body and it’s
             organs 

      •      Holds bones together, holds muscle to bone,
             holds organs in place.

      •      Thick and tough





3.         Muscular Tissue

      •      Has the ability to contract and allows for
             movement

4.         Nervous Tissue

      •      Has the ability to transport electrical
             impulses





 Functions:

  • Protection: multi-layered protects our       


         
    underlying tissues

      • Secretion: glandular (ex. Salivary glands)

      • Excretion: removal of wastes (ex. Sweat 


         
 glands)

      • Sensory perception: has a nerve supply

      • Reproduction: formation of reproductive 


         
 
 cells (glandular)





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          Characteristics:

1.         Arranged in sheets

      •      Thin and cover a large area

      •      Both single and multilayered

2.         Avascular

      •      Does not have a direct blood supply

      •      Connective Tissues underneath do have a
             blood supply

      •      Does have a nerve supply

      •      Has a high capacity for mitotic divisions





1.         Squamous - flat a scale-like

      •      Primary function is protection

      •      Very thin, allows materials to pass
             through





                                                             http://io.uwinnipeg.ca/~simmons/1115simple_sq_epit.jpg




2.         Cubiodal - cube shaped

      •      Have more volume than squamous cells





                     http://io.uwinnipeg.ca/~simmons/1115cuboidal_epit.jpg




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3.         Columnar - column shaped, tall and
           cylindrical, some have cilia on top

      •         Goblet cells are an example of specialized
                columnar cells which secrete mucous





                 http://io.uwinnipeg.ca/~simmons/1115collumnar_epit.jpg




  4.            Transitional - combination of
                different kinds of cells

           •      Has the ability to stretch and change
                  shape





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                      http://webanatomy.net/histology/epithelium/transitional.jpg




1.         Simple - single layer

      •      Usually found in an area where secretion and/or
             absorption is necessary

2.         Stratified - multi layered

      •      Usually found in areas where the cells function
             as protection

3.         Pseudostratified - generally made up of
           transitional cells

      •      Looks stratified by it’s not really

      •      Cells do not usually reach the surface





  Simple        Squamous:

      • Line the heart, bv and body cavities

  Stratified        Squamous:

      • Skin, oral cavity, pharynx, vocal folds, esophagus,
           vagina, anus

  Simple        Cuboidal:

      • Secretory cells and glands, terminal bronchioles of
           the lungs, ducuts of the reproductive tract.





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 Simple   Columnar:

  • Line the gastrointestinal tract for excretion
   and absorption

 Pseudostratified     Columnar:

  • Line the reproductive and respiratory tracts

 Transitional:

  • Line the bladder, allows for expansion





 Glandular  Epithelium - special cells
  that produce special substances

 Endocrine - secrete substances directly
  into the blood (ductless)

  • Carries substances around the body

 Exocrine - ducted to send substances to
 a specific area (has ducts)





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