Tissues

Question 1

Define the term ‘epithelium’ and describe the basic functions of epithelial surfaces, those covering the body and lining internal structures.

Answer 1

Epithelial tissue covers surfaces and separates compartments. It has no contact inhibition and forms cell-cell and cell-ECM junctions to fill any gaps between cells and cover surfaces effectively.

Question 2

Explain Cell-Cell Junctions

Answer 2

Desmosomes (adhering junctions) provide firm anchorage
Tight/Occluding Junctions seal intracellular spaces
Gap Junctions allow for cell-cell communication (literally have gaps between the cells)

Question 3

Explain Cell- ECM Junctions

Answer 3

Hemidesmosomes