Epithelia

Question 1

What are the 3 types of intercellular junctions?

Answer 1

Zonula Occludens (tight junction) - Seal intercellular spaces, form a continuous circumferential band around the apex of cells

Adherens junction - Adhering junctions (Zonula adherens) and desmosomes: mechanically strong attachments between cells, link cytoskeletons via intercellular cadherin proteins, catenins link cadherins to intracellular actin filaments

Gap junction - Gap, nexus or communicating junctions

Question 2

What is a goblet cell?

Answer 2

goblet cellis aglandularsimplecolumnar epithelial cell, main role of goblet cells is to secretemucusin order to protect themucous membraneswhere they are found

Question 3

list 4 examples of simple exocrine gland structures

Answer 3

1. simple tubular e.g. colon
2. simple coiled tubular e.g. sweat glands
3. simple branched tubular e.g. stomach
4. simple branched acinar e.g. salivary gland

Question 4

What are surface specialisations of epithelial cells?

Answer 4

cilia
microvilli
keratinisation