What is the role of the respiratory system in the human body?

The respiratory system is responsible for taking in oxygen from the environment and expelling carbon dioxide from the body. It consists of the lungs, airways, and muscles involved in breathing, such as the diaphragm. Oxygen is absorbed into the blood in the lungs and transported to cells throughout the body, where it is used for energy production. At the same time, carbon dioxide, a waste product of metabolism, is carried back to the lungs and expelled when we exhale. The respiratory system is vital for cellular function and overall health.