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Epithelial Tissue – lining, covering, & glandular
Connective – protecting, supporting, and binding together
Muscular – movement
Nervous - control
Major Tissue Types & Functions
Epithelial tissues lines all body surfaces and cavities
Functions: protection absorptionfiltrationsecretion
Epithelial Tissue
Special features of epithelial tissue: Cells are tightly bound together Basal surface attached to basement
membrane, apical surface is free. Avascular – no blood supply. Nutrition
and gases diffuse from underlying connective tissue
Excellent regenerative ability. Contain multi- and uni-potent stem cells.
Epithelial Tissue
Turn & Talk:
How does each special feature relate to the functions of epithelial tissue?
- 2 min
Epithelial Tissue
Simple squamous epithelium
A single layer of thin cells, specializing in rapid diffusion and filtration
Found in: alveoli of lungs, walls of capillaries, kidney glomeruli and serosae
Classification of Epithelial Tissues
Simple squamous epithelium
A single layer of thin cells, specializing in rapid diffusion and filtration
Found in: alveoli of lungs, walls of capillaries, kindey glomeruli, and serosae
Classification of Epithelial Tissues
Picture of alveoli of lungs.
Simple cuboidal epithelium
A single layer of cube- shaped cells
Found in: glands, kidney tubules, ovaries
Classification of Epithelial Tissues
Kidney tubules
Simple columnar epithelium
A single layer of tall shaped cells
Often contain mucus- producing Goblet cells and / or cilia Found in: digestive tract (unciliated), bronchi (ciliated), and uterine tubes (ciliated)
Classification of Epithelial Tissues
Small intestine
Simple columnar epithelium
A single layer of tall shaped cells
Often contain mucus- producing Goblet cells and / or cilia Found in: digestive tract (unciliated), bronchi (ciliated), and uterine tubes (ciliated)
Classification of Epithelial Tissues
Uterine tube
Pseudostratified columnar epithelium
A single layer of cells that differ in length.
Often contain cilia and Goblet cells
Found in: respiratory tract
Classification of Epithelial Tissues
trachea
Pseudostratified columnar epithelium
A single layer of cells that differ in length.
Often contain cilia and Goblet cells
Found in: respiratory tract
Classification of Epithelial Tissues
trachea
Notice that the nuclei appear at different levels.
For our purposes: nuclei at different levels + cilia = pseudostratified columnar epithelia
Stratified Squamous Epithelium
Multiple layers of epithelial tissue.
Flattened and atrophied (‘dead’) at the apical edge; but can be rounder at basal edge.
Apical edge sloughs off and is replaced.
Classification of Epithelial Tissues
Esophagus?
Function: protection from wear & tear
Found in skin, mouth, esophagus
Transitional epithelium
Cells can change shape, allowing the tissue to stretch.
Apical cells appear round when tissue is relaxed, and flat with tissue is stretched.
Found in urinary tract.
Classification of Epithelial Tissues
Ureter tube
Transitional epithelium
Cells can change shape, allowing the tissue to stretch.
Apical cells appear round when tissue is relaxed, and flat with tissue is stretched.
Found in urinary tract.
Classification of Epithelial Tissues
Ureter tube
Notice that the cells look rounded and irregular.
Show with fingers:
1) Simple squamous2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional
Quick Review: Epithelia Tissue
Show with fingers:
1) Simple squamous2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional
Quick Review: Epithelia Tissue
Notice the cube-like shapes, and single layers separated by basement membrane
Show with fingers:
1) Simple squamous2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional
Quick Review: Epithelia Tissue
Show with fingers:
1) Simple squamous2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional
Quick Review: Epithelia Tissue
Notice the many layers, and how the cells gradually become flatter
Show with fingers:
1) Pseudostratified columnar2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional
Quick Review: Epithelia Tissue
Show with fingers:
1) Pseudostratified columnar2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional
Quick Review: Epithelia Tissue
Notice multiple layers, cells rounded and irregular
Show with fingers:
1) Pseudostratified columnar2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional
Quick Review: Epithelia Tissue
Show with fingers:
1) Pseudostratified columnar2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional
Quick Review: Epithelia Tissue
Notice the nuclei at different levels, and the cilia
Examine the following tissues under a microscope:Simple cuboidal (kidney tubule)Simple columnar (uterine tube?)Stratified squamous (skin)Transitional (bladder?)Pseudostratified columnar (trachea?)
As you observe these, create a histology guide bysketching each tissue (USE COLOR & LABEL
IMPORTANT FEATURES). Jotting down any notes that will help you identify
the tissue in the futureUse your textbook to list both the FUNCTIONS and
LOCATIONS of the tissues.
You Do:
Spend the time to do this right!!
Draw carefully and accurately. Use color. Compare to your textbook.
ASK FOR HELP IF YOU AREN’T SURE IF YOU ARE SEEING IT!
You will get to use these notes on a lab practical!
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