Epithelium Lesson LC

ELAINE N. MARIEB

EIGHTH EDITION

3

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

PowerPoint® Lecture Slide Presentation by Jerry L. Cook, Sam Houston University

ESSENTIALS

OF HUMAN
ANATOMY
&PHYSIOLOGY

PART C
Cells and Tissues

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin
Cummings

Body Tissues

▪ Cells are specialized for particular functions

▪ Tissues

▪ Groups of cells with similar structure and

function

▪ Four primary types

▪ Epithelium

▪ Connective tissue

▪ Nervous tissue

▪ Muscle

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin
Cummings

Epithelial Tissues

▪ Found in different area

▪ Body coverings

▪ Body linings

▪ Glandular tissue

▪ Functions

▪ Protection

▪ Absorption

▪ Filtration

▪ Secretion

Multiple Choice

Which of the following is a function of epithelium?

• Conducting electrical impulses
• Producing movement
• Protection

• Storing energy

Multiple Select

Which of the following is a function of epithelium?

• Secretion

• Producing movement
• Storage

• Absorption

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin
Cummings

Epithelium Characteristics


▪ 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

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin
Cummings

Classification of Epithelium

▪ Number of cell layers

▪ Simple – one layer

▪ Stratified – more than 1 layer

Figure 3.17a

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin
Cummings

Classification of Epithelium

▪ Shape of cells

▪ Squamous – flattened

▪ Cuboidal – cube shaped

▪ Columnar – column-like

Figure 3.17b

Multiple Choice

What type of cells did we examine from the buccal region today?

• columnar epithelium

• squamous epithelium

• cuboidal epithelium

• pseudostratified epithelium

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin
Cummings

Simple Epithelium

▪ Simple squamous

▪ Single layer of flat cells

▪ Usually forms membranes

▪ Lines body cavities

▪ Lines lungs and capillaries

Figure 3.18a