PowerPoint ® Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PART C 3 Cells and Tissues

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Body Tissues  Tissues  Groups of cells with similar structure and function  Four primary types  Epithelial tissue (epithelium)  Connective tissue  Muscle tissue  Nervous tissue

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Epithelial Tissues  Locations  Body coverings & organ linings  Cells fit closely together and often form sheets  Functions  Protection  Absorption  Filtration  Secretion

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Classification of Epithelia  Number of cell layers  Simple—one layer  Stratified—more than one layer Figure 3.17a

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Classification of Epithelia  Shape of cells  Squamous  flattened  Cuboidal  cube-shaped  Columnar  column-like Figure 3.17b

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Simple Epithelia  Simple squamous  Single layer of flat cells  Used for rapid diffusion, forms membranes  Found: Lines lungs (air sacs) & capillaries

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Simple Epithelia Figure 3.18a

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Simple Epithelia  Simple cuboidal  Single layer of cube-like cells  Location: Walls/tubules of kidney, lines pancreas, salivary gladns  Fnx: secretes

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Simple Epithelia Figure 3.18b

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Simple Epithelia  Simple columnar  Single layer of tall cells  Often includes mucus-producing cells  Found: Lining digestive tract, stomach

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Simple Epithelia Figure 3.18c

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Simple Epithelia  Pseudostratified columnar  Single layer, but some cells are shorter than others, some with cilia  Cilia used to push substances across surface  Found: respiratory tract, trachea  May function in absorption or secretion

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Simple Epithelia Figure 3.18d

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Stratified Epithelia  Stratified squamous  Found as a protective covering where friction is common  Locations: Skin, Mouth, Esophagus, Vagina

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Stratified Epithelia Figure 3.18e

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Stratified Epithelia  Transitional epithelium  Shape of cells depends upon the amount of stretching  Found: Lining of the urinary/bladder

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Stratified Epithelia Figure 3.18f