Final answer:
Yes, it is true that epithelial tissues are avascular and do not contain blood vessels; they receive nutrients through diffusion from nearby tissues.
Step-by-step explanation:
True, epithelial tissues are avascular, meaning they do not contain blood vessels. Nutrients reach the epithelial cells via diffusion or absorption from underlying tissues or the surface. Epithelial tissues are specialized in replacing damaged and dead cells, a process that is essential for organs that face the external environment, such as the skin, airways, and digestive tract. This regenerative capability is vital for maintaining the integrity of barriers against the outside world, where epithelia are constantly exposed to potential damage.