Organ System

An organ system is a group of different organs that work together to do one major job for the body.

• Each organ in the system has a special role, and together they complete the whole task—like a team where each player has a position.
• Example: the digestive system includes the mouth, oesophagus, stomach, intestines, liver, and pancreas. Each organ does a part of digestion, and together they help the body get nutrients from food.
• Organ systems usually need coordination: one organ’s output becomes another organ’s input (for example, food is broken down in the stomach and then further digested and absorbed in the intestines).
• One organ can belong to more than one organ system. For instance, the pancreas helps digestion (digestive system) and also makes hormones like insulin (endocrine system).
• All organ systems are connected—if one system is not working well, others can get affected too (for example, the circulatory system carries oxygen and nutrients to every organ system).

Thinking in organ systems helps you understand how the body handles big tasks—like getting energy from food, breathing, moving, and removing wastes—by sharing the work among many organs.