Ch 4, 2 epithelial tissues Flashcards Preview

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Flashcards in Ch 4, 2 epithelial tissues Deck (11):
1

covering and lining epithelia

on external and internal surfaces, eg skin, serous membranes

2

glandular epithelia definition

secretory tissue in glands, eg. goblet cells, gastric glands

3

five common characteristics of epithelium

1. cells have polarity-apical and basal
2. composed of closely packed cells
3.supported by a connective tissue reticular lamina (under the basal lamina)
basal membrane=basal lamina/reticular lamina
4. Avascular but innervated
5. high rate of regeneration

4

classification on epithelia

1. number of layer
a, simple
b. stratified
2. shape of the cells
a. squamous
b. cuboidal
c. columnar

5

gland

one or more cells that make and secrete a product

6

endocrine glands

ductless glands that secrete hormones by exocytosis
directly into the blood or lymph
travel to target organ which has appropriate membrane receptor or enter cells

7

exocrine glands

more numerous that endocrine
secrete products into ducts onto body surfaces
release secretions onto body surfaces or into body cavities
ex, mucous, sweat, oil and salivary glands

8

types of exocrine glands

classified by number of cells, structure and mode of secretion
1. unicellular glands-goblet cells
2. multicellular glands- composed of duct and secretory unit

9

types of multicellular exocrine glands

duct type= simple or compound
secretory units=tubular, alveolar(sac), tubuloalveolar

10

merocrine

products are secreted by exocytosis
cells are long lived because they are not damaged during product release
--pancreas, sweat and salivary glands

11

holorine

product accumulates in apical cells and are released by rupture of cells
replaced by mitosis of basal cells
--sebaceous glands (oil)