The term for a group of similar cells working together to perform a specific function is tissue. Tissues are organized into several types, such as epithelial, muscle, nervous, and connective tissues, each serving unique roles in the body. For instance, epithelial tissue lines surfaces, muscle tissue facilitates movement, nervous tissue transmits signals, and connective tissue supports and binds other tissues. The collaboration among various types of tissue contributes to the overall function of organs and systems within an organism.