Question

Identify the substance which keeps the epithelial cells together:

Answer 1

Answer:

Epithelial cells are held together by tight junctions, adhering junction and desmosomes and attach to a specialized form of extracellular matrix called the basement membrane. Epithelial cells are polarized with an apical surface facing the lumen or external environment and a basal surface facing the basement membrane.

Answer 2

Answer:

Endothelial cells are thin, flat cells that are packed closely together to form a single layer of endothelium. The bottom surface of endothelium is attached to a basement membrane, while the free surface is usually exposed to fluid.