Final answer:
An organ system consists of multiple organs working together to perform a complex function, such as the digestive system which breaks down food and absorbs nutrients.
Step-by-step explanation:
An organ system is a group of organs that work together to perform a specific complex function in the body. For example, the human digestive system includes various organs such as the mouth, stomach, pancreas, gall bladder, and intestines, each carrying out a part of the digestion process. The mouth is responsible for ingestion, the stomach for crushing and liquefying food, the pancreas and gall bladder secrete digestive enzymes, and the intestines absorb nutrients into the blood. Collectively, these components and their individual functions contribute to the essential task of breaking down food and delivering necessary nutrients to the body.