Final answer:
An organ system is a group of organs that work together to perform life-sustaining functions, an example being the digestive system which processes food intake, nutrient absorption, and waste elimination.
Step-by-step explanation:
A group of organs performing life processes such as digestion, excretion, respiration, and others is called an organ system. Organ systems have different functions and unique roles to perform in physiology, which include but are not limited to organization, metabolism, responsiveness, movement, development, and reproduction.
An example is the digestive system, which is an organ system that breaks down food, absorbs nutrients, and eliminates waste. This system is made up of the mouth, esophagus, stomach, small and large intestines, and accessory organs like the pancreas and liver, which produce enzymes for digestion. While some processes are handled by a single organ, such as ingestion in the mouth or defecation in the anus, most digestive processes involve multiple organs working collectively as food moves through the alimentary canal.