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HISTOLOGY “What is that icky little tissue?”. Not All Cells Are Alike: Multi-Cellular Organisms: Require Cellular Specialization JOB BREAKDOWN: Coverings.

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Presentation on theme: "HISTOLOGY “What is that icky little tissue?”. Not All Cells Are Alike: Multi-Cellular Organisms: Require Cellular Specialization JOB BREAKDOWN: Coverings."— Presentation transcript:

1 HISTOLOGY “What is that icky little tissue?”

2 Not All Cells Are Alike: Multi-Cellular Organisms: Require Cellular Specialization JOB BREAKDOWN: Coverings Support Movement Control - Signaling

3 Tissues: “ Tissues: “Tissu” = Woven (Fabric) Epithelial: Coverings Connective: Support Muscle: Movement Nervous: Control - Signaling

4 Benefits and Pitfalls: What is gained by cellular specialization? What is sacrificed?

5 Tissues: Groups of cells with common structure and function

6 Epithelial Tissues “Covers” and “Boundries” Apical - Free Surface Basal - Basement Membrane

7 Basement Membrane Mix of CHO and Proteins Made by epithelial cells and underlying tissues (connective or muscle) Allows diffusion to epithelial cells

8 Classification Number of Layers: 1=simple, 2+ = stratified, (pseudostratified) Cell shapes: Squamous, Cuboidal, and Columnar

9 Structure / Function Relationships: Squamous: Thin layer, minimizing diffusion distance; smooth “covering” Cuboidal: Greater volume – greater metabolic activity Columnar: Complex functions – often secretory, having cilia/microvilli

10 Epithelial Functions Regulate passage of materials across epithelial layers Protect underlying layers Secretion / Absorption

11 QUESTION: What type of cells would you expect to find in blood capillaries?

12 What kind of cells in your mouth? Why?

13 Answers Answers: ENDOTHELIUM: Simple Squamous: short distance for diffusion Stratified squamous: protects against abrasion

14 Types of Connections Tight Junctions: Barriers Desmosomes: Mechanical Strength Gap Junction: Allow intercellular communication

15 Cell Connections Cell Connections: Turn Isolated Cells into Tissues - communities Allow communication Coordinate Function

16 Assignment: Do your Tissue Presentations and Overheads You (and possibly a partner) will be assigned to explain one type of tissue to the class: Discuss:(Information in Chapt4) Location Structure/Function Identify from an overhead

17 Presentation Grades Presentation Grades: Assignment worth 20 points Accuracy (10) Clarity (5) Thoroughness (5)

18 Read Chapt: 4:71-85 Answer Questions: Content Review (p. 93): 1,3-6, 9-11

19

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