Epithelial Cells: Simple + Stratified

Question 1

Types of Simple Epi

Answer 1

• Simple Squamous Epithelium
• Simple Cuboidal Epithelium
• Simple Columnar Epithelium

Question 2

Define Simple Squamous Epithelium

Answer 2

single layer of flat cells w/ disc shaped central nuclei and sparce cytoplasm

Question 3

Function of Simple Squamous Epithelium

Answer 3

allows permeability of molecules/ gases by diffusion and filtration where protection is not important; secretes lubricating substances in serosae

Question 4

SSE Location

Answer 4

Capillaries, alveoli (lungs), serous membrane, kidney glomeruli, lymphatic vessels

Question 5

Define Simple Cuboidal Epithelium

Answer 5

Single layer of cubed cells w/ large spherical central nuclei

Question 6

Function of Simple Cuboidal Epi

Answer 6

to absorb/ secrete fluids and substances

Question 7

Simple Cuboidal Epi location

Answer 7

Renal (kidney) tubules, ducts, follicles of the thyroid, secretory portions of small glands: ovary surface

Question 8

Define Simple Columnar Epi

Answer 8

single layer of tall cells (longer than they are wide) round to oval nuclei toward basal surface

Question 9

Function of Simple Columnar Epi

Answer 9

Usually allows molecules to pass through via active transport for absorption/secretion by ciliary action

Question 10

Simple Columnar Epi Location

Answer 10

Most of GI tract, (microvilli), Uterine tubes (ciliated) and bronchioles (ciliated)

Question 11

Characteristics of Simple Columnar Epi

Answer 11

Goblet cells
Brush Border

Question 12

Define Goblet Cells

Answer 12

Secrete mucin which becomes mucus to lubricate and protect the epi.

Question 13

Define Brush Border

Answer 13

aka microvilli
undistinguishable under light microscope; appearance “brush-like”

Question 14

Define pseudostratified columnar Epi

Answer 14

single layer of cells w. nuclei at varying locations due to cell size/ shape to make it seem multiple layers; for protection and absorption/ secretion

Question 15

Define Cilated pseudostratified columnar epithelium

Answer 15

goblet cells secrete mucin and cilia propels mucus

Question 16

Location of pseudo

Answer 16

(upper) Respiratory tract
- Nasal cavity, trachea, bronchi

Question 17

Types of Stratified Epi

Answer 17

• Keratinized Stratified Squamous Epithelium
• Nonkeratinized Stratified Squamous Epithelium
• Stratified Cuboidal Epithelium
• Stratified Columnar Epithelium
• Transitional Epithelium