Key Stage 3 (KS3) Science – Cells Practice Test 2025 - Free KS3 Science Practice Questions and Study Guide

An organ system is best described as a group of organs that work together to perform complex functions necessary for the survival and health of an organism. Each organ within the system has a specific role, and when combined, they contribute to a larger physiological process. For example, the digestive system includes organs such as the stomach, intestines, and liver, all of which collaborate to break down food, absorb nutrients, and manage waste.

This cooperation among organs allows the body to perform more refined and intricate tasks than what a single organ could accomplish on its own. In contrast, terms like a single organ performing a simple function, a collection of similar tissues, or a series of unrelated organs do not accurately depict the coordinated and interdependent nature of the organs within an organ system.