Chapter 4 Test Review Flashcards
(53 cards)
4 primary types of tissues
Epithelial
Connective
Muscular
Nervous
Epithelial tissue
Produces glandular secretions
Covers exposed surfaces
Lines internal passageways
Connective tissue
Fills internal spaces
Provides structural support
Stores energy
Transport
Muscle tissue
Contracts to produce movement
Nervous tissue
Propagates electrical impulses
Carries information
Extracellular Matrix (ECM)
Composed of the substances surrounding the cells in a tissue
Composed of ground substance and protein fibers
Functions include providing strength, directing cells within a tissue, regulating development and holding cells in position
Ground substance
Contains ECF- proteins and carbohydrates
Protein fibers
Embedded in ground substance
Provide tensile strength
Collagen, elastic, reticular
Types of cell junctions
Tight junctions
Desmosomes
Gap junctions
Tight junctions
Help to make spaces between cells impermeable
Desmosomes
Increase the resistance of the tissues to mechanical stress
Some materials may pass between
Gap junctions
Allow small substances to move from one cell to another
Locations of epithelia
Found on every internal and external body surface and act as a barrier btw the body and the external environment and btw the organs and fluid filled cavities
Functions of epithelia
Protection, immune defense, secretion, transport into other tissues, sensation
Covers exposed surfaces, lines internal passageways, forms glands
Characteristics of epithelia
Cellularity: closely packed cells
Polarity & attachment: 2 surfaces- apical (top), basolateral (attach to underlying connective tissue)
Avascular- lack of blood vessels
Classification of epithelia
# of cell layers Cell shape
Simple squamous epithelia
One cell layer- lining epithelium. Allows substances to pass through
Lungs and serous/mucous membranes, blood vessels
Simple cuboidal
Relatively thin, substances diffuse quickly across it.
Simple columnar
Lining epithelium- digestive tract, airways, Fallopian tubes
Stratified squamous
Protection
Covering epithelium- skin on body openings
Exocrine glands
Release their secretions to the surface of the epithelium- usually the exterior of the body
Products released by exocytosis or by shed and ruptured epithelial cells
Merocrine/Holocrine secretions
Unicellular glands
Simplest exocrine glands
Goblet cells- most common unicellular gland found in lining of digestive and respiratory tracts
Multicellular glands
Clusters of secretory cells arranged in different ways
Classified according to the structure of their ducts and the shape of their secretory cell clusters
Merocrine secretion
Excretion through salivary and sweat glands- products released by exocytosis