What is tissue made of?

Tissue is made up of a group of cells combined together that work together to perform specific functions. In the context of biology, tissues are collections of interconnected cells that share a similar structure and function. Examples of tissues in the human body include muscle tissue, which enables movement, and epithelial tissue, which forms protective layers around organs and structures.

While single cells can exist independently, they do not form tissues on their own. Additionally, when cells perform different functions, it does not fully capture how they organize into tissues—since tissues consist of a cohesive group of similar or specialized cells working collaboratively. Similarly, while fluids may be present in conjunction with tissues, they are not a defining characteristic of tissue itself; tissues primarily consist of cells forming a collective structure. Therefore, the most accurate description of tissue is that it is comprised of a group of cells working in concert.