What term refers to a group of similar cells that work together to perform a specific function?

• A. Tissue
• B. Organ
• C. Organ System
• D. Stimulus

Answer: (A)

Similar cells grouped to perform a common function form tissue. This is the middle level of biological organization: cells combine into tissues, tissues combine into organs, and organs combine into organ systems. Tissue specializes to carry out specific tasks, such as muscle tissue contracting to move, epithelial tissue protecting surfaces, or nervous tissue transmitting signals. An organ, like the heart, is made of different tissues working together. An organ system, such as the circulatory system, includes multiple organs. A stimulus is an environmental cue that elicits a response, not a tissue. So, the term for a group of similar cells working together is tissue.