Which system is responsible for gas exchange in the body?

The respiratory system is the primary system responsible for gas exchange in the body. Its main function is to bring oxygen into the body and remove carbon dioxide, a waste product of metabolism. This process occurs primarily in the lungs, where oxygen from inhaled air diffuses through the alveoli (tiny air sacs) into the bloodstream, and carbon dioxide from the blood diffuses into the alveoli to be exhaled.

The respiratory system includes various structures such as the nose, trachea, bronchi, and lungs, each playing a crucial role in facilitating breathing and ensuring that sufficient oxygen is delivered to the body's tissues. This system works in close collaboration with the circulatory system, which helps transport oxygen-rich blood throughout the body and returns carbon dioxide to the lungs for expulsion.

Other systems mentioned in the question do not directly participate in the gas exchange process. The circulatory system is involved in the transport of gases, but it does not handle the exchange itself. The nervous system regulates breathing but does not facilitate gas exchange, and the digestive system is primarily concerned with the breakdown of food and nutrient absorption, not respiratory functions. Therefore, the assertion that the respiratory system is responsible for gas exchange is accurate and reflects its fundamental role in maintaining the body's oxygen