Which term best defines a system?

• A. A single organ performing a specific function.
• B. A collection of cells forming tissues.
• C. A group of organs working together with a specific function.
• D. A network of nerves controlling movement.

Answer: (C)

A system is a group of parts that work together to perform a specific function. That makes the description of a group of organs working together with a specific function the best fit. Think of the digestive system: stomach, intestines, liver, pancreas, and other organs all coordinate to break down food and absorb nutrients. Each organ plays a role, but they only achieve the overall task when they act as a unit.

The other options fall short because one is just a single organ, not a system; another refers to cells forming tissues, which is an earlier level of organization; and describing a network of nerves points to part of a system (the nervous system) but doesn’t capture the idea of multiple organs collaborating to carry out a defined function.