Organ System Level: Which description best describes this level?

• A. Organs operate independently
• B. Organs work together to accomplish a common purpose
• C. Tissues operate without organs
• D. Cells become organs

Answer: (B)

At the organ system level, several organs work together to perform a broader function that supports the whole body. Each organ has a specialized job, and their activities are coordinated so the system can accomplish its common purpose—like digesting food, circulating blood, or exchanging gases. For example, the digestive system relies on multiple organs (mouth, esophagus, stomach, intestines, liver, pancreas) to break down nutrients, absorb them, and regulate energy. If organs didn’t coordinate, the system wouldn’t function to meet the body's needs. Tissues form organs, and organs are the functional units of organ systems, so cells alone or tissues without organs don’t capture the idea of a system working together.