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BIO221L Anatomy and Physiology
Questions:
Objectives:
List the four primary tissue types
List the functions of epithelial tissues
Know in general the location of epithelial tissue in the body
Understand the unique characteristics of epithelial tissue
Describe the components of connective tissue (cells, matrix [ground substance and fibers])
Understand the functions of connective tissue
List and understand the steps in tissue repair
Tissue: The Living Fabric
Individual body cells specialized
Each type performs specific functions that maintain homeostasis
Tissues
Groups of cells similar in structure that perform common or related function
Histology
Study of tissues
Studying Human Tissue: Microscopy
Tissue is fixed
Preserved
Cut
Sliced thin enough to transmit light or electrons
Stained
Enhances contrast
Epithelial Tissue Functions
Protection
Absorption
Filtration
Excretion
Secretion
Sensory reception
Epithelial Tissue (Epithelium)
Form boundaries
Two main types (by location)
Covering and lining epithelia
On external and internal surfaces
Glandular epithelia
Secretory tissue in glands
Types of Primary Tissues
Epithelial tissue
Covers
Connective tissue
Supports
Muscle tissue
Produces movement
Nerve tissue
Controls
Epithelial Tissue Functions
Protection
Absorption
Filtration
Excretion
Secretion
Sensory reception
Characteristics of Epithelial Tissue: Polarity
Cells have polarity
Apical surface (upper free) exposed to exterior or cavity
Basal surface (lower, attached)
Both surfaces differ in structure and function
Characteristics of Epithelial Tissue: Specialized Contacts
Covering and lining epithelial tissues fit closely together
Form continuous sheets
Specialized contacts bind adjacent cells
Lateral contacts
Tight junctions
Desmosomes
Characteristics of Epithelial Tissue: Avascular but Innervated
No blood vessels in epithelial tissue
Must be nourished by diffusion from underlying connective tissues
Is supplied by nerve fibers
Glandular Epithelia
Gland
One or more cells that makes and secretes an aqueous fluid called a secretion
Classified by
Site of product release—endocrine or exocrine
Relative number of cells forming the gland
unicellular (e.g., goblet cells) or multicellular
Aging Tissues
Normally function well through youth and middle age if adequate diet, circulation, and infrequent wounds and infections Epithelia thin with increasing age so more easily breached Tissue repair less efficient Bone, muscle and nervous tissues begin to atrophy DNA mutations possible increased cancer risk
BIO221L Anatomy and Physiology
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