classifications of epithelium

Question 1

simple squamous epithelium

Answer 1

purpose - filtration and diffusion
location:
covering serous membranes; pericardial, pleural, peritoneal, cavities
line inside of heart, blood vessels, lymphatic vessels
found in air sacs of lungs (alveoli), Bowman’s capsule of kidney, inner surface of airdrum

Question 2

simple cuboidal epithelium

Answer 2

purpose - secretion and absorption
location:
pancreas ducts; 
part of kidney tubules; 
smaller ducts of many glands; s
ecretory chambers of thyroid; 
anterior surface of lens; 
pigmented epithelium at posterior of retina

Question 3

non-ciliated simple columnar epithelium

Answer 3

have microvilli and goblet cells
function - secretion, lubrication, absorption
location:
lines gut mucosa from stomach to anus;
ducts of many glands;
gall bladder

Question 4

ciliated simple columnar epithelium

Answer 4

goblet cells
synchronous movement of cilia assists motility of mucous and foreign objects or oocytes; function - move materials
location:
some bronchioles;
uterine fallopian tubes;
sinuses;
central canal of spinal cord;
ventricles of brain

Question 5

keratinised stratified squamous epithelium

Answer 5

located where mechanical or chemical stresses are severe; where dehydration and mechanical stress are an issue; protect against microbes
apical cells packed with keratin
- protects against abrasion, water loss, UV radiation, foreign invasion
located in superficial layer of skin

Question 6

non-keratinised stratified squamous epithelium

Answer 6

protect against microbes;
lines wet surfaces, constantly moistened by mucous from salivary and mucous glands
location;
lining of mouth; oesophagus; vagina; part of epiglottis and pharynx; covers tongue

Question 7

stratified cuboidal epithelium

Answer 7

function - protection and limited secretion and absorption
fairly rare
location:
ducts in adult sweat and oesophagal glands
part of male urethra

Question 8

stratified columnar epithelium

Answer 8

function - protection and secretion
uncommon
location:
lines part of urethra;
large excretory ducts in some glands, eg. oesophagal glands;
small areas in anal mucous membrane;
part of conjunctiva of eye;
pharynx

Question 9

transitional epithelium

Answer 9

allows organ to stretch/expand and maintain protective lining without rupturing
lines urinary bladder and portions of ureters and urethra

Question 10

ciliated pseudostratified columnar epithelium

Answer 10

goblet cells and cilia - mucous traps foreign particles, cilia sweep away
lines airways of upper respiratory tract

Question 11

non-ciliated pseudostratified columnar epithelium

Answer 11

lacks cilia and goblet cells
functions in absorption and protection
lines epididymis, part of male urethra, larger ducts of many glands