EPITHELIAL TISSUES Flashcards
Principal function of ET
- Covering, lining, and protecting surfaces
- Absorption
- Secretion
4 Basic Types of Tissues
- Epithelial
- Connective
- Muscle
- Nervous
can be seen in blood vessels
squamous
can be seen in intestines
columnar
the connective tissue that underlies the epithelia lining the organs of the digestive, respiratory, and urinary systems
Lampina propria
– a thin, dense layer of extracellular matrix that lines most human tissues forming the supporting structure and scaffolding for epithelial tissue and separates different types of cells and protect them from mechanical stress.
Basement membrane
Anchors the epithelial cells
Basement membrane
Types of Epithelia
- Covering/Lining – skin, mucous membrane
- Secretory/Grandular - nasa glands
– without ducts
*excrete substances without the use ducts
*usually hormones
Endocrine
– with ducts
*excrete substances with ducts
* usually waste products
Exocrine
secretion releases products, usually containing proteins, by means of exocytosis at the apical end of the secretory cells.
. Merocrine gland
Most exocrine glands are____
merocrine
secretion is produced by the disintegration of the secretory cells themselves as they complete their terminal differentiation which involves becoming filled with product
Holocrine gland
_____are the best examples of holocrine glands.
Sebaceous glands of hair follicles
secretion involves loss of membrane enclosed apical cytoplasm, usually containing one or more lipid droplets.
Apocrine gland
