What is the BEST name for an epithelium that is one layer of flat cells (i.e., width of cells is greater than the height) that lines blood vessels?

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BlackTom AI · Accepted Answer

The question asks for the best name of the epithelium that lines blood vessels and is composed of a single layer of flat cells whose width exceeds their height.
Option 1: Urothelium. This type of epithelium lines the urinary tract (bladder, ureters) and is typically a stratified, transitional epithelium, not a single layer of flat cells, so it is incorrect here.
Option 2: Simple stratified epithelium. The term is a contradiction: 'simple' means one cell layer, while 'stratified' implies multiple layers. Since we’re given one layer, this option is conceptually mismatched and therefore not appropriate for lining vessels.
Option 3: Endothelium. This is the lining of blood vessels and lymphatic vessels, composed of a single layer of flattened (squamous) cells with a width greater than its height, which matches the description precisely.
Option 4: Nonciliated simple columnar epithelium. This epithelium consists of a single layer of tall, column-like cells, which are not flat; thus it does not fit the description of a single layer of flat cells lining vessels.
Option 5: Mesothelium. Mesothelium lines the serous cavities (peritoneum, pleura, pericardium), not the interior surface of blood vessels, so it is not the correct lining for vessels.
In summary, the descriptor of a single layer of flat, wide cells lining blood vessels aligns with the endothelium, while the other options describe epithelia that either are not single-layered squamous, not located in vessels, or have a different cellular shape.

ANATOMY 2300 AU2025 (34636) Unit 1: Histology

What is the BEST name for an epithelium that is one layer of flat cells (i.e., width of cells is greater than the height) that lines blood vessels?

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