Which system in the human body is responsible for gas exchange?

The respiratory system is responsible for gas exchange in the human body. This system includes structures such as the lungs, trachea, and bronchi, which work together to facilitate the inhalation of oxygen from the atmosphere and the exhalation of carbon dioxide, a waste product of metabolism. The oxygen that enters the lungs is then absorbed into the bloodstream through the alveoli, tiny sacs in the lungs, which are designed specifically for this purpose.

In contrast, the nervous system is primarily responsible for transmitting signals throughout the body to coordinate responses. The digestive system focuses on breaking down food and absorbing nutrients, while the skeletal system provides structural support, protection for organs, and facilitates movement but does not play a direct role in gas exchange. The specialized function of the respiratory system makes it vital for sustaining life by ensuring that the body's cells receive the oxygen they need for cellular respiration and by removing carbon dioxide to maintain proper acidity and gas balance in the body.