Which system is responsible for gas exchange in the body?

The respiratory system is the correct choice because it is specifically designed for facilitating gas exchange in the body. This system includes organs such as the lungs, bronchi, and alveoli. During the process of respiration, oxygen from the air is inhaled into the alveoli of the lungs, where it diffuses into the bloodstream. At the same time, carbon dioxide, a waste product of cellular metabolism, is transported from the blood into the alveoli to be exhaled. This exchange is critical for maintaining the body’s oxygen levels and removing carbon dioxide, ensuring the cells receive the oxygen they need for energy production and function.

Understanding the role of the respiratory system is vital, as it directly relates to overall health and the body’s ability to function properly. While other systems, like the cardiovascular system, assist in distributing oxygen to body tissues, they do not perform the act of gas exchange themselves. The nervous system is responsible for signaling and regulatory functions, while the digestive system deals primarily with nutrient intake and metabolism.