3.Simple squamous epithelium

One layer of squashed cells ...

graph TD
  A{simple squamous endothelium} --> B(endothelium)
  A -->  C(mesothelium)

Functions

1. Endothelium Surrounding blood vessels- passage of fluid from capillary to interstitial side

2. Mesothelium Surrounding visceral organs( lung, heart )

2.Simple columnar Epithelium

Functions

• absorption, transport , secretion etc..(kidney tubules, thyroid...)

3.Simple Columnar Epithelium

• microvilli present

Functions

• more abortion and secretion than cuboidal(gi , gall bladder)