FunMed epithelia and glands Flashcards
where do you find simple squamous cells?
outer surface of organs and blood vessels
where do you find the mesothelium?
lining of the pleua
what sort of epithelium is the mesothelium
simple squamous
what is the advantage of the shape of simple squamous cells?
ideal for diffusion of gases
what sort of cells line the endothelium?
simple squamous
where do you find simple cuboidal epithelia
glands and ducts
name 4 ducts lined with simple cuboidal epithelial cells
salivary
where is the nucleus normally found in simple cuboidal cells?
near the basement membrane
where do you find simple cuboidal cells
areas of active absorption of material eg stomach
what do simple columnar cell often have on the apical surface?
microvilli
what do microvilli look like in LM pictures
brush border
what holds up microvilli?
actin filaments
what are pseudostratified cells?
squished in but not stratified
where so you find cilia?
respiratory tract
what are cillia made of?
microtubule and DYNEIN protein
what do cilia do?
waft mucus
where would you find non-keratinising stratified squamous cells?
places which are abrased but also lubricated eg oesophagus
where do you find keratinised stratified squamous cell
skin
what are microtubules made of
tubulin protein
what is metaplasia
one type of tissue (say stratified cuboidal) is replaced by another (say stratified squamous)
what is neoplasia
literally new growth. Often dodgy. Cells grow autonomously without need for growth signals. Can metastasise
what are transitional epithelial cells
ONLY FOUND IN THE URINARY SYSTEM<br></br>when bladder is empty
where do you find stratified cuboidal cells
Big glands - mammary
what are the specialised functions of stratified cuboidal cells?
layer of cells keeping lumen and underlying tissue separate<br></br>specialised for selective absorptions and secretions<br></br>many junctions keeping the fluid IN THE LUMEN
- nearest to apical surface
- occluding junction
- determines which ions & molecules diffuse between cells
