Iweefsel

Iweefsel is a term used in some contexts to refer to the organized groups of cells and extracellular matrix that form tissues in multicellular organisms. In biology, tissues are the building blocks that perform specific functions and are organized into four primary classes: epithelial, connective, muscle, and nervous tissue.

Tissues are composed of cells embedded in an extracellular matrix, whose composition and structure vary by tissue type. The matrix provides support, mediates signaling, and influences cell behavior. Epithelial tissue consists of tightly packed cells that cover surfaces and line cavities; connective tissue provides structural support and stores energy; muscle tissue contracts to produce movement; nervous tissue conducts electrical impulses and processes information.

Tissues originate from three germ layers during embryonic development, and cells differentiate into specialized phenotypes. Regeneration capacity differs: epithelial tissues often renew rapidly; connective tissues vary; nervous and cardiac muscle have limited regenerative ability.

Functionally, tissues enable protection, exchange, movement, secretion, sensation, and coordination. Clinically, tissue integrity is essential; injury can trigger inflammation and remodeling. Pathologies include fibrosis, necrosis, atrophy, and cancer arising from tissue of origin. Biopsy and histology are fundamental for diagnosis, while tissue engineering and regenerative medicine aim to create or repair tissues.

In some linguistic or regional usages, weefsel-based terms, including iweefsel, are encountered as synonyms for tissue; however, many contexts use the standard term weefsel or tissue. The underlying concept remains the same: organized cellular assemblies with extracellular matrix that carry out specific physiological roles.