What are similarities and differences between epithelial and muscle tissue?

Epithelial and muscle tissues are both essential components of the body, but they serve different functions. Both types are formed by closely packed cells, but epithelial tissue primarily functions in protection, absorption, and secretion, while muscle tissue is specialized for contraction and movement. Epithelial tissue is avascular (lacking blood vessels) and relies on underlying connective tissue for nutrients, whereas muscle tissue is highly vascularized to support its metabolic needs. Additionally, epithelial cells are often arranged in layers, whereas muscle cells are organized into fibers that enable contraction.