Lining the peritoneal cavity are simple squamous epithelia. These epithelia facilitate the movement of viscera, active transport via pinocytosis, and secretion of biologically active molecules. Simple squamous epithelium can be found lining body vessels (endothelium), and in the serous cavity linings, e.g., pericardium, pleura, and peritoneum.

Simple cuboidal epithelia mainly cover and secrete substances. They have a cuboidal shape as their name suggests and their greater thickness allows cytoplasm to be rich in mitochondria and other organelles for a high level of active transport across the epithelium. They can be found in the ovaries, kidneys, and thyroid gland.

Nonciliated simple columnar epithelia have the main functions of protecting, lubricating, secreting, and absorbing. These epithelia are taller than they are wide. They also have terminal bars, i.e., complexes of tight and adherent junctions, in their apical ends. These epithelia may be found in the kidneys, oviduct, and gallbladder lining.

REFERENCE:
Mescher, A. (2018). Junqueira’s basic histology: text and atlas (15th ed.). Mcgraw Hill Education.