Tissues Flashcards
(110 cards)
What are the two different types of epithelium?
Covering/lining and glandular
What is the basal lamina composed of?
Glycoproteins secreted by epithelia cells
What is the purpose of the basal lamina?
It acts as a selective filter for molecules entering the epithelium from the connective tissue and acts as a scaffolding for migrating epithelial cells during wound repair
What are the two components of the basement membrane and where do they originate?
The basal lamina originating from the epithelial cells and the reticular lamina originating from the connective tissue
What is the reticular lamina composed of?
A fine network of collagen fibers
What keeps epithelium as continuous sheets of cells?
Tight junctions and desmosomes
Where would you find simple cuboidal epithelium?
The ducts and secretory portions of small glands, kidney tubules, ovary surface
Where would you find simple squamous epithelium?
Kidney glomeruli, air sacs of lungs, lining of the heart, serosae, blood vessels, and lymphatic vessels
What are the main functions of simple squamous epithelium?
Passage of materials in areas of low abrasion and high diffusion, secretes lubricating substances in the serosae
What epithelial tissue type would you find in the endothelium and mesothelium?
Simple squamous
What two epithelial tissue types share the chief functions of secretion and absorption?
Simple columnar and simple cuboidal
Where would you find simple columnar epithelium in the body?
Lining the digestive tract from stomach to rectum, gallbladder, excretory ducts of some glands, small bronchi, uterine tubes, some regions of the uterus
Where would you find pseudostratified columnar epithelium?
Lining the trachea and most of the upper respiratory tract (ciliated), and in sperm-carrying ducts and the ducts of large glands (nonciliated)
Where would you find non-keratinized stratified squamous epithelium?
Forming the linings of the mouth, esophagus, and vagina
Where would you find keratinized stratified squamous epithelium?
Epidermis of the skin
What two modifications of the digestive tract epithelium make it ideal for secretion and absorption?
Microvilli, goblet cells
Besides the digestive tract, where can goblet cells commonly be found?
Within ciliated pseudostratified epithelia of the respiratory tract
What epithelial tissue type is found in the pharynx, male urethra, the lining of some glandular ducts, and occurs at transition areas between two other types of epithelia?
Stratified columnar
Which layer of stratified columnar tissue is actually columnar?
The apical layer
What type of epithelial tissue is found in the mammary, salivary, and sweat glands and enhances their durability and structure?
Stratified cuboidal
How many layers does stratified cuboidal epithelia typically have?
Two
What is a gland?
Epithelia that consists of one or more cells that make and secrete an aqueous fluid
Where does an endocrine gland secrete its product?
Into the blood
Where does an exocrine gland excrete its product?
Into a body cavity or onto the skin