BIOL G220: Ch. 4 Flashcards
Terms and concepts from Chapter 4: Tissues and lab slides/models
tissue
group of similar cells and extracellular products that perform a common function
four types of tissue in the body
epithelial tissue
connective tissue
muscle tissue
nervous tissue
tissues vary in structure, function and the content of their ______
extracellular matrix
extracellular matrix
a substance produced by the cells of a specific tissue and can contain protein, salts, water, and dissolved macromolecules
located outside of cells
epithelial tissue general characteristics (6)
cellular polar attached avascular innervated high regeneration capacit
organs are line on the ____ and ___ by epithelial tissues
outside, inside
The majority of ____ are derived from epithelial tissue
glands
How much ECM does epithelial tissue hold?
little to none
cellularity
composed almost entirely of cells with little extracellular matrix
cells are bound together by _____
intercellular junctions
polarity
epithelial cells have an apical and basal surface where they attach to underlying cells
attachment
basal surface is attached to a thing basement membrane
basement membrane
an acellular structure product by both epithelial and underlying connective tissue cells
avascularity
lacking blood vessels
where does epithelial tissue gain their nutrients from if it is avascular?
receive nutrients by diffusion from underlying tissues
innervation in epithelia
richly innervated to detect changes in environment at a body or organ region
epithelial tissue’s regeneration capacity and why
high because apical surface is constantly exposed to the environment
epithelial cells are frequently damaged/die and are replaced as quickly as they are lost
three different surfaces of epithelium
apical surface, lateral surface, basal surface
functions of epithelial tissue (4)
physical protection
selective permeability
secretion
sensation
physical protection with epithelial tissue
from dehydration and abrasion, as well as physical, chemical, and biological agents
selectively permeability with epithelial tissue
regulate the passage of certain molecules in or out of certain region of the body
secretion with epithelial tissue
some epithelial cells called exocrine (and endocrine) cells produce secretions such as sweat or oil
sensation with epithelial tissue
possession of nerve endings that can detect light, taste, sound, smell, and hearing
basement membrane function
provides physical support and anchoring of epithelium tissue
acts as a barrier to regulate passage of large molecules between epithelium and underlying connective tissue