Biology Marking Period 3 Practice Test

An organ system is a group of organs that work together to perform a specific function for the body. Each organ brings its specialized role, and they coordinate—often through signals like hormones or nerves—to accomplish a larger task, such as digestion or circulation. For instance, the digestive system includes multiple organs like the stomach, intestines, liver, and pancreas, all collaborating to break down food, absorb nutrients, and remove waste. A single organ, like the stomach, handles only a part of that process. A cell is far smaller and not an assembled set of organs, and a living thing refers to the whole organism that contains one or more organ systems. Hence, the option describing a group of organs working together to perform a function best matches the concept.