What is the primary function of the respiratory system?

The primary function of the respiratory system is to exchange gases, specifically oxygen and carbon dioxide, between the body and the environment. This process occurs mainly in the lungs, where oxygen from inhaled air is transferred into the bloodstream, and carbon dioxide, a waste product of cellular metabolism, is removed from the blood and exhaled.

This gas exchange is vital for maintaining the body’s metabolic processes, as cells require oxygen for energy production and need to eliminate carbon dioxide to maintain acid-base balance. The respiratory system plays a critical role in ensuring that this exchange occurs efficiently, thus supporting overall health and function of the body.

The options regarding digestion, nutrient transport, and body temperature regulation relate to different systems in the body. Digestion is the function of the digestive system, transporting nutrients is the role of the circulatory system, and regulating body temperature is primarily managed by the integumentary and thermoregulatory systems.