Epithelial Tissue

• EPITHELIAL General Characteristics:

  = • Main glandular tissue (glands)

  = • Cells reproduce rapidly

  = • Cells tightly packed together

  = • Attached to underlying connective tissue
• EPITHELIAL FUNCTION

  = Protection

  = Secretion

  = Absorption

  = Excretion

  = Sensory Perception

  = Cover/lining of organs
• Simple Squamous


  Location: heart and blood vessels, exchange surfaces of lungs

  Function: reduces friction, controls vessel permeability
• Simple Squamous Epithelium

  A) Simple Squamous Epithelium

  B) Stratified Squamous Epithelium

  C) Lining of Peritonial cavity

  D) Surface of toungue

  
• Simple Cuboidal


  Function: limited protection, performs absorption and secretion

  Location: glands, ducts, kidney tubules
• Simple Columnar Epithelium


  Function: to secrete chemicals & absorb nutrients

  Location: lining of digestive tract (stomach, intestines)
• Stratified Squamous Epithelium


  Function: protection from injury

  Location: Skin
• Pseudostratified (Ciliated) Epithelium


  Function: movement of mucus or egg by action of cilia

  Location: nasal cavity, trachea and bronchi, oviducts (fallopian tubes)
• Ciliated Columnar Epithelium 


  Location: Large bronchioles of the respiratory tract and in the genitourinary tract
• Transitional epithelium


  Location: urinary bladder

  Function: permit expansion and recoil after stretching