This statement about epithelial tissue is incorrect

The correct option (the incorrect statement about epithelial tissue) is: "epithelial cells rest on a cellular basement membrane splitting it from underlying connective tissues".

Here is a detailed, step-by-step educational breakdown of why this statement is incorrect, and why the other options are biologically accurate:

1. The Nature of the Basement Membrane (Why the selected option is incorrect):
The basement membrane is a thin, fibrous structure that anchors epithelial tissue to the underlying connective tissue. However, the basement membrane itself is completely acellular (non-cellular). It does not contain cells; rather, it is a extracellular matrix composed of protein fibers and glycoproteins (such as collagen, laminin, and proteoglycans) secreted jointly by the epithelial cells (forming the basal lamina) and the underlying connective tissue cells (forming the reticular lamina). Thus, stating that it is a "cellular" membrane is incorrect.

2. Analysis of the Correct Statements:
• "Covers the external body surface and the internal surface of some organs": This is a defining characteristic of epithelial tissue. It forms the outer protective layer of the skin (epidermis) and lines the walls of internal cavities and organs, such as the digestive tract, lungs, and blood vessels.
• "Adjacent cells are held by cell junctions with very little extracellular material": Epithelial tissues are composed of tightly packed cells with minimal space between them. Specialized membrane proteins form cell junctions (such as tight junctions, desmosomes, and gap junctions) that physically hold the cells together to create a secure barrier.
• "No blood vessels that supply nutrients to the epithelial cells": Epithelial tissue is entirely avascular, meaning it does not contain blood vessels. Epithelial cells rely on the diffusion of nutrients and oxygen from blood vessels located in the adjacent connective tissue, passing through the permeable basement membrane.