What is the primary function of epithelial tissues?

The primary function of epithelial tissues is to cover body surfaces. Epithelial tissues form protective layers that line the surfaces of organs, cavities, and the exterior of the body. This protective function is crucial as it acts as a barrier against mechanical injury, pathogens, and fluid loss. Additionally, epithelial tissues can be specialized for absorption, secretion, and sensation, showcasing their versatility beyond simply covering surfaces.

While other tissue types may primarily transport nutrients, provide structural support, or store energy, these functions do not align with the main role of epithelial tissues. Instead, the covering and lining role of epithelium plays a vital part in maintaining homeostasis and protecting underlying structures.