Epithelial Tissues

Question 1

What are the layers of epithelial membrane?

Answer 1

apical, lateral, basal

Question 2

What is on the apical surface?

Answer 2

cilia, flagella, microvilli, stereocilia

Question 3

What is on the lateral surface?

Answer 3

cell junctions and adhesions

Question 4

Zonula Occludens/Tight Junction

Answer 4

on cell apex, seals off the intercellular space, attache specific integral membrane occludins

Question 5

Zonula Adherens/Adhering Junction

Answer 5

basal to tight junction, maintains seal, actin microfilament forms terminal web to attach to plaque via cadherins

Question 6

Gap Junction/Nexus & Communication Junction

Answer 6

disk shape with intracellular gap, form continuous pores that bridge intercellular gap, found in most tissues

Question 7

Macula Adherens/Desmosome

Answer 7

see with attachment plaques, cadherins insert to plaques via intermediate filaments, stablilize attachments, but allow flow

Question 8

hemidesmosomes

Answer 8

cytoplasmic surface basal, integrins mediate connection between basal lamina and intermediate filaments, adaptor proteins connect integrins

Question 9

What’s on the basal surface?

Answer 9

Epithelial cells rest

Question 10

What makes up basement membrane?

Answer 10

reticular lamina and basal lamina

Question 11

What makes up basal lamina?

Answer 11

lamina lucida and lamina densa

Question 12

Location simple squamous

Answer 12

posterior cornea, blood vessel & lymph (endothelium), body cavities (mesothelium)

Question 13

location pesudostratified

Answer 13

respiratory tract (have long cilia)

Question 14

location of translational epithelium

Answer 14

4-6 cell layers with two nuclei, lines urinary tract

Question 15

Location simple cuboidal

Answer 15

mostly in kidney, some have microvilli

Question 16

location of columnar

Answer 16

elongated and oval nucleus, GI, Oviducts, male reproduction

Question 17

Stratified Squamous (keratinized)

Answer 17

thick and thin skin, restricts friction/water

Question 18

Metaplasia

Answer 18

Reverse one cell type to another

Question 19

Stratified Squamous (nonkeratinized)

Answer 19

wet surface keep nuclei, lines mouth, oral pharynx, esophagus, vocal cord, vagina

Question 20

Stratified Cuboidal Epithelium

Answer 20

ducts of salivary glands, large exocrine/sweat glands, basal layer appears incomplete

Question 21

Stratified Columnar Epithelium

Answer 21

2-3 layers, top have columnar cells, basal layer has cuboidal cells, larger ducts of exocrine glands, conjunctiva eyelid