Chapter 4: Tissues Flashcards
group of specialized cells and the extracellular substances surrounding them
tissues
microscopic study of tissue structure
histology
4 basic tissue type
- epithelial tissue
- nervous tissue
- muscle tissue
- connective tissue
- covering or lining tissue
- cellular tissue
- also present in exocrine and endocrine glands
epithelial tissues
classifications of epithelial tissues based on number of cell layers
- simple epithelium
- stratified epithelium
- pseudostratified
classifications of epithelial tissues based on idealized shapes of the epithelial cells
- squamous epithelium
- cuboidal epithelium
- columnar epithelium
- more than one layer of cuboids
- relatively rare
- sweat gland ducts, ovarian follicular cells, salivary glands
- functions in absorption, secretion, protection
stratified cuboidal epithelium
- more than one layer, only the surface is columnar
- deeper layers are irregular or cuboidal
- relatively rare
- mammary gland ducts, larynx, and a portion of male urethra
- carries out secretion, protection, and some absorption
stratified columnar epithelium
- not in contact with other cells
- can be smooth or folded and have microvilli and cilia
free cell surfaces
cell connections
- desmosomes
- hemidesmosomes
- tight junctions
- adhesion belts
- gap junctions
- mechanical links
- bind cells together
desmosomes
cells to basement membrane
hemidesmosomes
- form barriers
- near free surface
- surround each cell
tight junctions
help tight junctions
adhesion belts
for intercellular communication
gap junctions
- secretory organs
- composed of epithelial tissues
glands
types of glands
- endocrine glands
- exocrine glands
ductless gland that produces chemicals
endocrine gland
produce variety of products such as saliva, sweat, digestive tract secretions
exocrine glands
classifications of exocrine glands acc to structure of ducts
- simple gland
- compound gland
classification of exocrine glands acc to secretory region
- tubular
- acinar / alveolar
classifications of exocrine glands acc to how products leave the cell
- merocrine secretion
- apocrine secretion
- holocrine secretion
release by exocytosis
merocrine gland
release as pinched-off fragments
apocrine gland
shedding of entire cells
holocrine gland
- a primary tissue type found in every organ.
- distinct from other tissue types due to its abundant extracellular matrix.
- diverse in both structure and function
connective tissue
suffix that means “creates the matrix”
-blast
suffix that means “maintains the matrix”
-cyte
suffix that means “breaks the matrix down for remodeling
-clast
loose connective tissue is composed of:
- areolar
- adipose
- reticular
- a fine network of fibers with spaces between the fibers
- fibroblasts, macrophages and lymphocytes are located in the spaces
areolar connective tissue
little extracellular matrix surrounding cells
adipose tissue
fine network of reticular fibers irregularly arranged
reticular tissue
dense connective tissue is composed of:
- regular
- irregular
- elastic
matrix composed of collagen fibers running in somewhat the same direction in tendons and ligaments
dense regular collagenous
matrix composed of collagen fibers and elastin fibers running in somewhat the same direction in elastic ligaments
dense regular elastic
supporting connective tissue is composed of:
- cartilage
- bone