Anatomy and Physiology by lbK8L7VH

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									    Anatomy and
     Physiology

        Histology Unit
Mrs. Hoyle
          HISTOLOGY

Histology - study of tissues

Tissues - the collection of
 specialized cells that perform a
 specific function.
       4 TYPES OF TISSUES
A. Epithelia       B. Connective

covers exposed    fills internal spaces
 surfaces
                   provides structural
lines internal     support
 passageways and
 chambers          stores energy
C. Muscle               D. Neural

contracts to provide   conducts electrical
 active movement         impulses and carries
                         information
           Epithelial Tissue
• No blood vessels (avascular)
• functions:
1. Provide physical protection.
2. Control permeability
3. Provide sensations
4. Produce specialized secretions. Gland cells
   Exocrine - leave body
   Endocrine - released internally by gland cells
  ( ex. Hormones)
             Simple Squamous




Structure - one layer of thin flat cells

Function - reduce friction, control vessel permeability,
absorption and secretion.

Location - lines ventral body cavities, lines the heart and
blood vessels
Simple Cuboidal
     Structure - one layer of cubed
     shaped cells


     Function - limited protection ,
     secretion and absorption


     Location - glands , ducts ,
     urinary tract * kidney tubules
Simple Columnar
       Structure - one layer of
       column shaped cells


       Function - protection,
       secretion and absorption.


       Location - lines the digestive
       tract
            Stratified Squamous




Structure - many layers of flat thin cells

Function - physical protection from: abrasion, pathogens,
and
  chemical attack

Location - surface of the skin, lines mouth ,throat rectum,
 esophagus
Stratified Cuboidal
           Structure - many
           layer of cubed shape
           cells
           Function -
           protection ,
           secretion and
           absorption
           Location - lining of
           some ducts, (rare)
           ex.. Sweat gland
           duct
            Stratified Columnar




Structure - many layers of column shape cells

Function - protection

Location - salivary glands , large passageways of
 the respiratory tract, digestive and reproductive
           Transitional Epithelia




Structure - different shapes of cells in layers

Function- permit expansion and contraction

Location - urinary bladder
   Pseudostratified Columnar
                               Structure - one layer
                               of column shaped cells

                               Function - protection
                               and
                               secretion

                               Location - male
                               reproductive,
                               respiratory tract
                                ex. Trachea

**These cell often exhibit cilia on their surface.
           Good Web Sites
• http://www3.umdnj.edu/histsweb
• http://www.kumc.edu/instruction/medicine/
  anatomy/histoweb/

								
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