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Tissues - PowerPoint PPT Presentation


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Tissues. What is a tissue? Groups of cells working together to perform a function Four Basic Types of Tissues Epithelial Covers surfaces, lines cavities, forms glands Connective Protect/support, stores energy, provides immunity Muscle Causes movement Nervous

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tissue basics

What is a tissue?Groups of cells working together to perform a function

  • Four Basic Types of Tissues
    • Epithelial
      • Covers surfaces, lines cavities, forms glands
    • Connective
      • Protect/support, stores energy, provides immunity
    • Muscle
      • Causes movement
    • Nervous
      • Detects changes, sends/receives impulses

Tissue Basics

epithelial tissue characteristics

Arranged in closely packed sheets

        • Singular or multiple layers
  • Layered
      • Apical surface (most superficial)
        • Exposed to outer most layer of body cavities
        • Lines organs or exterior of body
      • Lateral surface (cells facing cells)
      • Basal Layer (deepest layer of cells)
      • Basement membrane fibers that bind and support
  • Avascular: Lacking blood vessels
      • Materials are exchanged by diffusion from connective tissue
  • Contain a nerve supply
  • High capacity for renewal

Epithelial Tissue Characteristics

epithelial tissue

Called: Epithelium = singular, Epithelia = plural

  • Two Types:
    • Covering and Lining
      • Outer covering of the skin and internal organs
      • Lines body cavities and interiors of some systems, blood vessels
    • Glandular
      • Makes up the secreting portions of glands
        • Ex: Sweat glands

Epithelial Tissue

basic epithelia shapes
Basic Epithelia Shapes
  • Categorized as either:
    • Simple cells organized in a SINGLE layer
      • Found where diffusion, osmosis, filtration, secretion, and absorption occur
    • Stratified cells organized in 2 or more layers
      • Found where protection is needed and there is often wear and tear
simple epithelium
Simple Epithelium
  • Squamous= flat cells
    • Important for filtration (kidneys) or diffusion (lungs & capillaries)
  • Cuboidal= cube shaped cells
    • Important for secretion and absorption
  • Columnar= column shaped cells
    • Important in absorption and secretion of mucus
stratified epithelium
Stratified Epithelium
  • Squamous= flat cells
    • Apical layer cells are flat
    • Deep layers vary from cuboidal to columnar
    • Cells in the basal layer divide and move upward toward apical surface
    • Found in areas of surface wear & tear to provide protection
      • Mouth
      • Esophagus
      • Vagina
      • Tongue
stratified epithelium1
Stratified Epithelium
  • Cuboidal= cube shaped cells
    • Apical and basal layers are cuboidal
    • Found in areas where protection, secretion, and absorption take place
      • Ducts of sweat glands
      • Esophageal glands
      • Male urethra
stratified epithelium2
Stratified Epithelium
  • Columnar= column shaped cells
    • Apical layer cells are columnar
    • Found in areas where protection and secretion take place
      • Lines urethra
      • Esophageal glands
      • Anal mucous membrane
      • Conjunctiva of the eye