Endothelium can be found lining blood vessels. What makes endothelium different from regular old epithelium? Cells bind

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Endothelium can be found lining blood vessels. What makesendothelium different from regular old epithelium?
Cells bind together more loosely to permit nutrient movement
It's more slippery than regular epithelium
It binds via desmosomes rather than tight junctions
It secretes serous fluid