Which of the following is a function of the respiratory system?

• A. Regulation of body temperature
• B. Gas exchange between blood and the environment
• C. Production of hormones
• D. Detoxification

Answer: (B)

The function of the respiratory system that is most relevant is gas exchange between blood and the environment. This crucial process involves the inhalation of oxygen, which is then transported into the bloodstream, and the exhalation of carbon dioxide, a waste product of cellular metabolism. The oxygen taken in by the lungs diffuses into the blood in the alveoli, while carbon dioxide diffuses out to be expelled from the body. This exchange is vital for maintaining the respiration process and ensuring that cells receive the oxygen necessary for energy production while removing carbon dioxide to prevent toxicity.

In contrast, while the regulation of body temperature, production of hormones, and detoxification may involve other physiological systems, they do not directly pertain to the core function of the respiratory system. The respiratory system focuses specifically on facilitating gas exchange, making it essential for sustaining cellular life and supporting metabolic activities.