Which system includes organs responsible for gas exchange in the body?

The respiratory system is specifically designed for gas exchange in the body, primarily involving the intake of oxygen and the expulsion of carbon dioxide. This system comprises key organs such as the lungs, where this exchange occurs in the alveoli—a series of tiny air sacs that facilitate the diffusion of gas between the air and the bloodstream.

During inhalation, oxygen-rich air enters the lungs, and oxygen passes through the alveolar walls into the blood, while carbon dioxide moves from the blood into the alveoli to be exhaled. This exchange is vital for maintaining the body's oxygen levels and removing waste gases. The design and functionality of the respiratory system ensure that gas exchange occurs efficiently, making it crucial for sustaining life.

In contrast, the digestive system is involved in nutrient breakdown and absorption, the nervous system coordinates body functions and processes information, and the musculoskeletal system provides structure and movement, none of which are directly involved in gas exchange.