Biomedical Science Practice Exam 2026 – Full Prep Guide

A system is a collection of parts that work together to perform a function or set of functions. In biology, examples include the circulatory system or the nervous system, where organs, tissues, and cells collaborate to achieve a coordinated operation like circulating blood or transmitting signals. The idea depends on interaction and interdependence among the parts, not just listing individual pieces. A single component or a single part refers to one piece rather than the whole assembled unit, and a group is just a collection without implying that the items function as an integrated whole. So the term that best describes the described collection is system.