Histology- Epithelial Tissue

Question 1

Epithelial Tissue Function:

Answer 1

-covers exposed surfaces
-lines internal passageways & chambers
-forms glands
-physical protection
-control permeability
-provide sensation

Question 2

Epithelia:

Answer 2

-layers of cells that cover internal or external structures

Question 3

Glands:

Answer 3

-structures that produce fluid secretions
-either attached to or derived from epithelia

Question 4

Epithelia Characteristics:

Answer 4

-cells bound closely together
-polarity (differences between exposed(apical) and attached (basal) surfaces
——-attached to basal lamina (basement layer w connective tissue)
-avascular
-cells continuously replaced quickly

Question 5

Classification of Epithelia:

Answer 5

-cell shape (squamous, cuboidal, columnar)
-number of cell layers (simple, stratified)

Question 6

Squamous Epithelia:

Answer 6

-thin, flat, irregular

Question 7

Simple Squamous Epithelia Functions:

Answer 7

-absorption and diffusion
OR
-slick slippery surface

Question 8

Simple Squamous Epithelia Locations:

Answer 8

-alveoli
-mesothelium
-endothelium

Question 9

Mesothelium:

Answer 9

-simple squamous epithelium
-lines body cavities
ex. pleura, pericardium

Question 10

Endothelium:

Answer 10

-simple squamous epithelium
-lines heart and blood vessels

Question 11

Stratified Squamous Epithelia Functions:

Answer 11

-protects where mechanical stresses are severe

Question 12

Stratified Squamous Epithelia Locations:

Answer 12

-skin
-lining of mouth
-esophagus
-anus
-vagina
-keratin
—> tough and water resistant

Question 13

Simple Cuboidal Epithelia Functions

Answer 13

-secretion & absorption

Question 14

Simple Cuboidal Epithelia Location:

Answer 14

-lines portions of kidney tubules

Question 15

Stratified Cuboidal Epithelia Functions

Answer 15

-rare
-form glands

Question 16

Stratified Cuboidal Epithelia Location:

Answer 16

-sweat, salivary, and mammary ducts

Question 17

Transitional Epithelia Functions:

Answer 17

-tolerated repeated cycles of stretching and recoiling
-returns to previous shape without damage

Question 18

Transitional Epithelia Location:

Answer 18

-Urinary bladder
-when empty, tissue appears with many layers & superficially plump (like cuboidal cells)
-when full, tissue appears flattened (like simple epithelium)

Question 19

Simple Columnar Epithelia Function & Location:

Answer 19

-absorption and secretion
-small and large intestine
(secretions protect against chemical stresses)

Question 20

Pseudostratified Columnar Epithelia Function:

Answer 20

-varying shapes and functions(based on location)
ex. (absorption and secretion, protection, transport)

Question 21

Ciliated Pseudostratified Columnar Epithelia Location::

Answer 21

-nasal cavity
-respiratory airways
-reproductive tract
—-> fallopian tubes, vas deferens??

Question 22

Stratified Columnar Epithelia Function:

Answer 22

-protection

Question 23

Stratified Columnar Epithelia Location:

Answer 23

-portions of pharynx
-epiglottis
-anus
-urethra