Challenge Problem 1. Identify the type of cells that receive and transmit information. 2. These cells are very useful if you go without eating for a long time. 3. Name the 2 types of cells for reproduction. 4. What is the function of epithelial cells?

Tissues: Epithelial Tissue Chapter 2

Body Tissues Slide 3.41 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Cells are specialized for particular functions  Tissues  Groups of cells with similar structure and function  Four primary types  Epithelium  Connective tissue  Nervous tissue  Muscle

Epithelial Tissues Slide 3.42 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Found in different areas  Body coverings  Body linings  Glandular tissue  Functions  Protection  Absorption  Filtration  Secretion

Epithelium Characteristics Slide 3.43 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Cells fit closely together  Tissue layer always has one free surface  The lower surface is bound by a basement membrane  Avascular (have no blood supply)  Regenerate easily if well nourished

Classification of Epithelium Slide 3.44a Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Number of cell layers  Simple – one layer  Stratified – more than one layer Figure 3.16a

Classification of Epithelium Slide 3.44b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Shape of cells  Squamous – flattened  Cuboidal – cube-shaped  Columnar – column-like Figure 3.16b

Simple Epithelium Slide 3.45 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Simple squamous  Single layer of flat cells  Usually forms membranes  Lines body cavities  Lines lungs and capillaries Figure 3.17a

Simple Epithelium Slide 3.46 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Simple cuboidal  Single layer of cube-like cells  Common in glands and their ducts  Forms walls of kidney tubules  Covers the ovaries Figure 3.17b

Simple Epithelium Slide 3.47 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Simple columnar  Single layer of tall cells  Often includes goblet cells, which produce mucus  Lines digestive tract Figure 3.17c

Simple Epithelium Slide 3.48 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Pseudostratified  Single layer, but some cells are shorter than others  Often looks like a double cell layer  Sometimes ciliated, such as in the respiratory tract  May function in absorption or secretion Figure 3.17d

Stratified Epithelium Slide 3.49 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Stratified squamous  Cells at the free edge are flattened  Found as a protective covering where friction is common  Locations  Skin  Mouth  Esophagus Figure 3.17e

Stratified Epithelium Slide 3.50 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Stratified cuboidal  Two layers of cuboidal cells  Stratified columnar  Surface cells are columnar, cells underneath vary in size and shape  Stratified cuboidal and columnar  Rare in human body  Found mainly in ducts of large glands

Stratified Epithelium Slide 3.51 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Transitional epithelium  Shape of cells depends upon the amount of stretching  Lines organs of the urinary system Figure 3.17f

Quick Quiz What kind of epithelial tissue lines body cavities? Simple squamous What kind of epithelial tissue is found in the mouth, skin, and esophagus? Stratified Squamous If an epithelial tissue has many layers of squamous cells, how would we catagorize it? Stratified Squamous

Color the different shapes different colors Draw and color a basement membrane for each tissue types When everyone at your table is finished with each tissue type I will stamp your papers

Turn in your Epithelium Worksheet Once directed Get 1 microscope per pair Make sure it is on Low power and lights off Put a paper towel down Get 1-2 slides from me

Turn in your Epithelium Worksheet Get ‘Examining Epithelial Tissue’ lab from the front Read the FLT and all the instructions for the lab Once directed Get 1 microscope per pair Make sure it is on Low power and lights off Put a paper towel down Get 1-2 slides from me and set on paper towel

Challenge Problem- NC 1. Identify the tissues to the right and below

Challenge Problem Identify the tissue to the  right and below

To Do Today 1. Finish and turn in Epithelial Lab 2. Turn in Epithelial Tissue Models 3. Complete Workbook pages 31-33, 38-40

Complete Epithelial Tissue Obs Think about the table at which you left off You will be going to the following table 15 min to make last observation You will get time at the end to go to other stations where you may not have finished