Lecture 4 Learning Objectives

Question 1

List general characteristics of epithelial tissues

Answer 1

Relatively uniform geometric shape
Tightly bound with highly specialized molecular complexes that form tight junctions
Relatively little intercellular matrix
Typically display free surfaces
Apical domains - surfaces in contact with lumen or external environment
Basolateral domains
Do not contain blood vessels
Basement membrane of basal lamina and reticular lamina

Question 2

List major criteria used to classify epithelial tissues

Answer 2

Simple 
Stratified 
or 
Squamous 
Cuboidal 
Rectangular

Question 3

Characterize and compare the apical and Basolateral membranes of epithelial cells

Answer 3

Apical: categorized by surface modification such as cilia or Microvilli - face lumen or external environment
Basolateral- sides and bases of the cells are characterized by intercellular junctions. In contact with basement membrane and surrounding cells

Question 4

Types of specializations that occur on the apical surface

Answer 4

Microvilli (brush border)
CIlia
Stereo cilia

Question 5

Simple squamous epithelium locations

Answer 5

Lumina of ducts, vessels and other tubular structures. Walls of aveoli, bowman’s capsules and inner surfaces of membranes, tympanic membrane

Question 6

Locations of simple cuboidal epithelium

Answer 6

Surface of ovary, pigmented epithelium of retina, kidney tubules, glands and ducts, terminal bronchioles, choroid plexus, anterior capsule of lens of eye

Question 7

Locations of simple columnar

Answer 7

Ileum and small intestine

Question 8

Locations of stratified squamous epithelium with moderate keratin

Answer 8

Esophagus and vagina

Question 9

Location of Stratified squamous epithelium with abundant keratin

Answer 9

Epidermis

Question 10

Pseudostratified

Answer 10

Simple epithelium appears to be stratified but all cells are in contact with basal lamina- therefore simple

Question 11

Transitional epithelium

Answer 11

Simple epithelium with appearance of having more than one layer because of positions of nucle
Urotheium - ureter

Question 12

General functions of epithelial tissues

Answer 12

Covering and lining 
Glandular 
Protection 
Maintain concentration differences 
Secretion or absorption

Question 13

Describe apical surface and relate to function

Answer 13

Microvilli - absorption
Cilia- move stuff around
Stereocilia- sperm shit up