Body Tissues

© 2018 Pearson Education, Inc. Tissues Groups of cells with similar structure and function Four primary types: Epithelial tissue (epithelium) Connective tissue Muscle tissue Nervous tissue © 2018 Pearson Education, Inc.

© 2018 Pearson Education, Inc. Epithelial Tissue Locations: Body coverings Body linings Glandular tissue Functions: Protection Absorption Filtration Secretion © 2018 Pearson Education, Inc.

© 2018 Pearson Education, Inc. Epithelial Tissue Hallmarks of epithelial tissues: Cover and line body surfaces Often form sheets with one free surface, the apical surface, and an anchored surface, the basement membrane Avascular (no blood supply) Regenerate easily if well nourished © 2018 Pearson Education, Inc.

© 2018 Pearson Education, Inc. Epithelial Tissue Classification of epithelia Number of cell layers Simple—one layer Stratified—more than one layer Shape of cells Squamous—flattened, like fish scales Cuboidal—cube-shaped, like dice Columnar—shaped like columns © 2018 Pearson Education, Inc.

Figure 3.17a Classification and functions of epithelia. Apical surface Basal surface Simple Apical surface Basal surface Stratified (a) Classification based on number of cell layers

Figure 3.17b Classification and functions of epithelia. Squamous Cuboidal Columnar (b) Classification based on cell shape