TISSUES. Tissue: A Definition A group of connected, interdependent cells that cooperate to perform a specific function.

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Presentation transcript:

TISSUES

Tissue: A Definition A group of connected, interdependent cells that cooperate to perform a specific function

Categories of Tissue 1. Epithelial Tissue 2. Connective Tissue 3. Muscle Tissue 4. Nervous Tissue

Epithelial Tissues General Features Cellular Layer + Basement Membrane

Epithelial Tissues General Features Cellular Layer + Basement Membrane No Direct Circulation/Blood Supply Touch Each Other Rapid Rate of Cell Reproduction

Epithelial Tissues Structural Classification Cell Shapes

Columnar Cuboidal Squamous

Epithelial Tissues Structural Classification Cell Shapes Cell Layers

Simple

Stratified

Epithelial Tissues Major Types

Simple Squamous Epithelium

Function: Exchange Sample Locations: Alveoli, capillaries

Stratified Squamous Epithelium

Function: Protection Sample Locations: Skin, Mouth, Repro tracts

Simple Cuboidal Epithelium Function: Absorption or Secretion Sample Locations: Kidney, Hormone Glands

Simple Columnar Epithelium Function: Absorption (or Secretion) Sample Location: Digestive Tract Microvilli

Simple Columnar Note goblet cells

Pseudostratified Columnar Epithelium Note cilia

Pseudostratified Columnar Epithelium

Function: Absorption, Secretion, Movement Sample Locations: Respiratory & Repro Ducts

Transitional Epithelium Function: Stretchability Sample Location: Urinary Bladder

What kind of tissue is this?

Epithelium cont. Epithelium that lines cavities sits on lamina propria. –Supports epithelium –Binds epithelium to other tissue –Provides nutrition Sides of cells are named –Basal –Apical (free) –Lateral

Basal Lamina-Lamina Propria

Intercellular Junctions Belts that circle cell. ZO (tight junction) acts as barrier. ZA provides for adhesion of one cell to another Spots Des is like a spot welding. Gap allows passage of chemical for communication.

Gap Junction

Specializations of Cell Surface Microvilli –Found mainly on absorptive cells –Brush border, 1  high Cilia / flagella –Cylindrical, motile structures, 5-10  high –Contain microtubules –Basal bodies

Microvilli Apical region of an intestinal epithelial cell seen with TEM. Filaments that constitute the core of the microvilli are clearly seen. An extracellular cell coat (glycocalyx) is bound to the plasmalemma of the microvilli. x45,000.

Cilia