What do you call a group of tissues that work together to perform closely related functions?

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

Answer: (D)

A group of tissues that work together to perform closely related functions is an organ. Tissues are made of similar cells that carry out a specific task. When several different tissues come together in one structure to carry out a broader function, that structure becomes an organ. For example, the heart contains muscle tissue to contract, nerve tissue to control the rhythm, and connective tissue to hold everything in place, all collaborating to pump blood. This differs from a cell (the basic unit of life) and a tissue (a collection of similar cells). It also sits above a tissue in the levels of organization, with organ systems formed by groups of organs that work together, such as the digestive or circulatory systems.