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16 Cards in this Set

  • Front
  • Back
Epithelial Tissue (Epithelium): What are the two main types and their location?
(1) Covering and lining epithelia {On external and internal surfaces} (2) Glandular epithelia {Secretory tissue in glands}
What are some of the characteristics of the Epithelial Tissue?
(1) Cells have polarity—apical (upper, free) and basal (lower, attached) surfaces (2) Are composed of closely packed cells (3) Supported by a connective tissue reticular lamina (under the basal lamina) (4) Avascular but innervated (nervess) (5) High rate of regeneration
(1) What makes up a simple epithelium? (2) What makes up a stratified epithelium?
(1) one layer (2) More than one layer
What are three types of/or classification of Epithelia?
(1) Squamous (2) Cuboidal (3) Columnar
What is the description, function and location of: Simple squamous epithelium
[Description]: Single layer of flattened
cells with disc-shaped central nuclei
and sparse cytoplasm; the simplest
of the epithelia. [Function]: Allows passage of materials by diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae.
What is the description, function and location of: Simple cuboidal epithelium
[Description]:Single layer of
cubelike cells with large,
spherical central nuclei.[Function]:Secretion and
absorption.[Location]:Kidney tubules; ducts and secretory portions of small glands; ovary surface
What is the description, function and location of: Simple columnar epithelium
[Description]: Single layer of tall cells
with round to oval nuclei; some cells
bear cilia; layer may contain mucus-
secreting unicellular glands [Function]: Absorption; secretion of
mucus, enzymes, and other substances;ciliated type propels mucus (or eproductive cells) by ciliary action. [Location]Nonciliated type lines most of the digestive tract (stomach to anal canal), gallbladder, and excretory ducts of some glands; ciliated variety lines small bronchi, uterine tubes, and some regions of the uterus.
What is the description, function and location of: Pseudostratified columnar epithelium
[Description]: Single layer of cells of
differing heights, some not reaching
the free surface; nuclei seen at
different levels; may contain mucus-
secreting cells and bear cilia.[Function]:Secretion, particularly of
mucus; propulsion of mucus by
ciliary action.[Location]:Nonciliated type in male’s sperm-carrying ducts and ducts of large glands; ciliated variety lines the trachea, most of the upper respiratory tract.
What is the description, function and location of: Stratified squamous epithelium
[Description]: Thick membrane
composed of several cell layers;
basal cells are cuboidal or columnar
and metabolically active; surface
cells are flattened (squamous); in the keratinized type, the surface cells are full of keratin and dead; basal cells are active in mitosis and produce the cells of the more superficial layers [Function] Protects underlying
tissues in areas subjected to abrasion [Location] Nonkeratinized type forms the moist linings of the esophagus,mouth, and vagina; keratinized variety forms the epidermis of the skin, a dry membrane.
Name some traits of: Epithelia: Stratified Cuboidal
(1) Quite rare in body (2) Found in some sweat and mammary glands
(3) Typically two cell layers thick
Name some traits of: Epithelia: Stratified Columnar
(1) Limited distribution in body (2) Small amounts in pharynx, male urethra, and lining some glandular ducts (3) Also occurs at transition areas between two other types of epithelia
What is the description, function and location of: Transitional epithelium
[Description]: Resembles both
stratified squamous and stratified
cuboidal; basal cells cuboidal or
columnar; surface cells dome shaped or squamouslike, depending
on degree of organ stretch. [Function] Stretches readily and
permits distension of urinary organ
by contained urine.[Location] Lines the ureters, urinary bladder, and part of the urethra.
What is a gland?
One or more cells that makes and secretes an aqueous fluid
How is the Glandular Epithelia classified?
(1) Site of product release (2) Relative number of cells forming the gland
(1) What is the description of the Endocrine gland? (2) What does it do?
(1) Ductless glands (2) Secrete hormones that travel through lymph or blood to target organs
What is the description of the Exocrine gland?
(1) More numerous than endocrine glands (2) Secrete products into ducts (3) Secretions released onto body surfaces (skin) or into body cavities (4) Examples include mucous, sweat, oil, and salivary glands