What is the function of the respiratory system in humans?

The respiratory system is essential for gas exchange, taking in oxygen and expelling carbon dioxide from the body. It includes the lungs, airways, and respiratory muscles, such as the diaphragm. Oxygen from the air enters the lungs and is absorbed into the bloodstream, where it is transported to tissues and organs. At the same time, carbon dioxide, a waste product of metabolism, is removed from the blood and expelled through exhalation. The respiratory system plays a key role in maintaining the body’s pH balance and overall health.