CLE 3251.1.2 Investigate the interrelationship between the structures and functions of the main body systems C h a p t e r 4 The Tissue Level of Organization.

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CLE Investigate the interrelationship between the structures and functions of the main body systems C h a p t e r 4 The Tissue Level of Organization PowerPoint® Lecture Slides prepared by Jason LaPres Lone Star College - North Harris Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings

CLE Investigate the interrelationship between the structures and functions of the main body systems Four Types of Tissues  Tissues are collections of cells and cell products that perform specific, limited functions  Types of tissue  Epithelial tissue  Covers exposed surfaces  Lines internal passageways  Forms glands

CLE Investigate the interrelationship between the structures and functions of the main body systems Four Types of Tissues  Types of Tissue (cont’d)  Connective tissue  Fills internal spaces  Supports other tissues  Transports materials  Stores energy  Muscle tissue  Specialized for contraction  Skeletal muscle, heart muscle, and walls of hollow organs  Neural tissue  Carries electrical signals from one part of the body to another

CLE Investigate the interrelationship between the structures and functions of the main body systems Epithelial Tissues  Epithelia  Layers of cells covering internal or external surfaces  Glands  Structures that produce secretions

CLE Investigate the interrelationship between the structures and functions of the main body systems Epithelial Tissues  Characteristics of Epithelia  Cellularity (cell junctions)  Polarity (apical and basal surfaces)  Attachment (basal lamina)  Avascularity  Regeneration

CLE Investigate the interrelationship between the structures and functions of the main body systems Epithelial Tissues Figure 4–1 The Polarity of Epithelial Cells.

CLE Investigate the interrelationship between the structures and functions of the main body systems Epithelial Tissues  Functions of Epithelial Tissue  Provide physical protection  Control permeability  Provide sensation  Produce specialized secretions (glandular epithelium)

CLE Investigate the interrelationship between the structures and functions of the main body systems Epithelial Tissues  Specializations of Epithelial Cells  Move fluids over the epithelium (protection)  Move fluids through the epithelium (permeability)  Produce secretions (protection and messengers)  Free Surface and Attached Surface  Polarity  Apical surfaces: –microvilli increase absorption or secretion –cilia (ciliated epithelium) move fluid  Basolateral surfaces

CLE Investigate the interrelationship between the structures and functions of the main body systems Epithelial Tissues  Maintaining the Integrity of Epithelia  Intercellular connections  Attachment to basal lamina  Epithelial maintenance and repair

CLE Investigate the interrelationship between the structures and functions of the main body systems Epithelial Tissues  Attachment to the Basal Lamina  Clear layer (Lamina lucida)  Thin layer  Secreted by epithelia  Barrier to proteins  Dense layer (Lamina densa)  Thick fibers  Produced by connective tissue  Strength and filtration

CLE Investigate the interrelationship between the structures and functions of the main body systems Epithelial Tissues  Epithelial Maintenance and Repair  Epithelia are replaced by division of germinative cells (stem cells)  Near basal lamina

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia  Singular epithelium; plural epithelia  Classes of Epithelia  Based on shape  Squamous epithelia: thin and flat  Cuboidal epithelia: square shaped  Columnar epithelia: tall, slender rectangles  Based on layers  Simple epithelium: single layer of cells  Stratified epithelium: several layers of cells

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia  Squamous Epithelia  Simple squamous epithelium  Absorption and diffusion  Mesothelium  Lines body cavities  Endothelium  Lines heart and blood vessels

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia Figure 4–3 Squamous Epithelia.

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia  Squamous Epithelia  Stratified squamous epithelium  Protects against attacks  Keratin protein adds strength and water resistance

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia Figure 4–3 Squamous Epithelia.

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia  Cuboidal Epithelia  Simple cuboidal epithelium  Secretion and absorption  Stratified cuboidal epithelia  Sweat ducts and mammary ducts

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia Figure 4–4 Cuboidal Epithelia.

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia Figure 4–4 Cuboidal Epithelia.

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia  Transitional Epithelium  Tolerates repeated cycles of stretching and recoiling and returns to its previous shape without damage  Appearance changes as stretching occurs  Situated in regions of the urinary system (e.g. urinary bladder)

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia Figure 4–4 Cuboidal Epithelia.

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia  Columnar Epithelia  Simple columnar epithelium  Absorption and secretion  Pseudostratified columnar epithelium  Cilia movement  Stratified columnar epithelium  Protection

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia Figure 4–5 Columnar Epithelia.

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia Figure 4–5 Columnar Epithelia.

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia Figure 4–5 Columnar Epithelia.

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia  Glandular Epithelia  Endocrine glands  Release hormones: –into interstitial fluid –no ducts  Exocrine glands  Produce secretions: –onto epithelial surfaces –through ducts Mechanisms of Glandular Secretion

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia  Glandular Epithelia  Types of secretions  Serous glands: –watery secretions  Mucous glands: –secrete mucins  Mixed exocrine glands: –both serous and mucous

CLE Investigate the interrelationship between the structures and functions of the main body systems Classification of Epithelia  Glandular Epithelia  Gland structure  Unicellular glands –Mucous (goblet) cells are the only unicellular exocrine glands: »scattered among epithelia »for example, in intestinal lining