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11 Cards in this Set
- Front
- Back
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4 Basic Tissues
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1. Muscle
2. Nervous 3. Connective 4. Epithelial |
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Epithelial Tissue
Function: |
1. PROTECTS underlying tissues and organs
2. TRANSPORTS material between tissues and organs 3. ABSORBS substances from a free surface or lumen 4. SYNTHESIS & SECRETION |
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Epithelial Tissue
2 types: |
1. Surface - covers external and internal body surfaces
2. Glandular - forms the functional units of glands |
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SURFACE Epithelium
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1. Simple squamous
2. Simple cuboidal 3. Simple columnar 4. STRATIFIED squamous, non-keratinzed 5. STRAITIFIED squamous, keratinized 6. STRATIFIED cuboidal 7. STRATIFIED columnar (rare) 8. Pseudostratified: single layer; nuclei at different heights 9. Transitional: stratified; empty (apical cells dome, thicker epithelium) |
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Surface Epithelium
Polarity: |
-Epithelial tissues LINES body surfaces, thus its basal and apical surfaces are exposed to different environments
-Result is that epithelial cells show both SURFACE AND INTRACELLULAR POLARITY |
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Polarity
What is on the lateral surface? |
Junctional complexes link cells together
1. Zonula Occludens or Tight Junction - barrier 2. Zonula Adherens - adherence zone 3. Macula Adherens or Desmosome - adherence spot 4. Gap or Communicating Junction - substances move between cells |
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Polarity
What is on the basal surface? |
Junctions link cells to underlying connective tissue
1. Hemidesmosome |
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Polarity
INTRACELLULAR polarity - Basal and Apical |
Basal
1. Nucleus 2. Mitochondria 3. RER Apical 1. Golgi apparatus 2. Secretory vesicles |
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What does Glandular Epithelium invade into
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Underlying CT
-Secretory units and ducts |
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Two parts of a gland
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1. Parenchyma - functional unit of gland, epithelial tissue
2. Stroma - supportive unit of gland, connective tissue |
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Two types of glands - based on distribution of product
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1. EXOCRINE - product is released into a duct connected to a free surface
2. ENDOCRINE- product is released into surrounding CT and is taken up by blood for distribution |
