Epithelial Slides

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

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

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Cummings

Classification of Epithelium

▪ Shape of cells

▪ Squamous – flattened

▪ Cuboidal – cube shaped

▪ Columnar – column-like

Figure 3.17b

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