Which organ describes a body part that performs a complex function?

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

Answer: (A)

An organ is a body part made up of multiple tissues that work together to perform a specific, often complex function. For example, the heart uses muscle tissue to contract, connective tissue for structure, and nerves to regulate rhythm, all coordinating to pump blood. This is different from a tissue, which is a group of similar cells carrying out a common task, or a cell, the basic unit of life. An organ system is a larger unit—the group of organs that work together to carry out broader processes, like circulation or digestion. So the body part that performs a complex function is described as an organ.