Challenge Problem1. 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 TissuesBody Tissues

Slide 3.41Copyright © 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 TissuesEpithelial Tissues

Slide 3.42Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Found in different areas Body coverings Body linings Glandular tissue

Functions Protection Absorption Filtration Secretion

Epithelium CharacteristicsEpithelium Characteristics

Slide 3.43Copyright © 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 EpitheliumClassification of Epithelium

Slide 3.44aCopyright © 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 EpitheliumClassification of Epithelium

Slide 3.44bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Shape of cells

Squamous – flattened

Cuboidal – cube-shaped

Columnar – column-like

Figure 3.16b

Simple EpitheliumSimple Epithelium

Slide 3.45Copyright © 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 EpitheliumSimple Epithelium

Slide 3.46Copyright © 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 EpitheliumSimple Epithelium

Slide 3.47Copyright © 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 EpitheliumSimple Epithelium

Slide 3.48Copyright © 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 EpitheliumStratified Epithelium

Slide 3.49Copyright © 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 EpitheliumStratified Epithelium

Slide 3.50Copyright © 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 EpitheliumStratified Epithelium

Slide 3.51Copyright © 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 directedGet 1 microscope per pairMake sure it is on Low power and lights offPut a paper towel downGet 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