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Warm-Up What is a tissue? The study of tissues is called ______.

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Presentation on theme: "Warm-Up What is a tissue? The study of tissues is called ______."— Presentation transcript:

1 Warm-Up What is a tissue? The study of tissues is called ______.
What are the 4 main types of tissues?

2 Warm-Up 1. 2. 3. 4. What type of epithelial cell is shown below?
Simple Columnar Epithelium Pseudostratified Columnar Epithelium 3. 4. Simple Cuboidal Epithelium Stratified Squamous Epithelium

3 Tissue: The Living Fabric

4 Tissue: group of cells that are similar in structure and function
Histology: study of tissues Types of Tissues: Epithelium (covering) Connective (support) Muscle (movement) Nervous (control)

5 Preparing tissues for microscopy
Specimen is fixed (preserved) Cut into thin sections (slices) Stained with colored dyes

6 Part I: Epithelial Tissue

7 Epithelial Tissue “epithe” = laid on, covering Structure:
Covering and lining epithelium Glandular epithelium Function: Protection Absorption Filtration Secretion

8 Special Properties Polarity
Apical surface = exposed free surface or edge (some with microvilli, cilia) Basal surface = lower, attached surface Specialized contacts Fits close together to form continuous sheets

9 Special Properties Supported by connective tissue
Rests on basement membrane No blood supply (avascular) Rely on diffusion and underlying connective tissue for food/O2 Regeneration – Replace lost cells

10 Classification Two names = (# cell layers) + (shape of cells)
Cell Layers: simple or stratified Shapes: squamous, cuboidal, or columnar

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14 Lumen: the opening of a tube, vessel or hollow organ, surrounded by epithelial tissue.

15 Simple Epithelium Absorption, secretion, filtration
Very thin – only one cell layer

16 Simple Epithelium Lumen Lumen Lumen L

17 Simple Epithelium Simple squamous Filtration, rapid diffusion
Capillary walls, air sacs in lungs, kidney filtration Serous membranes: slick layer lining ventral body cavity and its organs Air sac

18 Simple Epithelium Simple cuboidal Secretion & absorption
Lines ducts of glands (salivary), kidney tubules, ovary surface Lumen

19 Simple Epithelium Simple columnar Absorption and secretion
Lines digestive tract Microvilli, cilia Mucous membranes: lubricating mucus Lumen

20 Simple Epithelium Pseudostratified columnar
Rests on basement membrane – false impression (pseudo) of being multi-layered Secretes or absorbs Respiratory tract – cilia propels mucus from lungs Golbet Cells – secrete mucus Lumen Lumen Goblet Cells

21 Stratified Epithelium
2+ layers, more durable Main function = protect

22 Stratified Epithelium
Stratified squamous Withstand abuse, friction Esophagus, mouth, outer portion of skin

23 Stratified Epithelium
Stratified cuboidal Usually 2 layers Mainly in ducts of large glands (sweat, mammary, salivary) Lumen Lumen Sweat Gland Esophageal Gland

24 Stratified Epithelium
Stratified columnar Thick, waterproof layer Pharynx, male urethra, lining ducts Lumen Lumen

25 Transitional Epithelium
Able to change shape (cuboidal  squamous) Lining of hollow urinary organs (bladder, ureter, urethra) Stretches when filled with urine Lumen

26 Glandular Epithelium Gland: make and secrete a particular product
2 Types: Endocrine gland: produce hormones secreted into tissue fluid or bloodstream Exocrine gland: secrete products into ducts  onto body surfaces or body cavities Eg. mucous, sweat, oil, saliva, bile

27 Exocrine Glands Unicellular Multicellular Mucus cells or goblet cells
Duct structure


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