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The respiratory system is composed of organs that facilitate gas exchange between the blood and the external environment. Which of the following describes the group of organs that function during gas exchange?

A Organ System

Tissues are a collection of specialized cells that perform a specific functions (e.g. protection, support, nerve conduction and movement). A group of tissues that has a specialized function is referred to as an organ. A group of organs that work together to perform several related functions is an organ system.