Which of the following systems works to remove excess carbon dioxide from the body?

• A. The digestive system
• B. The nervous system
• C. The urinary system
• D. The respiratory system

Answer: (D)

The respiratory system is primarily responsible for removing excess carbon dioxide from the body. This system includes the lungs and airways, which facilitate the exchange of gases. During respiration, oxygen is inhaled and transported to the bloodstream, while carbon dioxide, a waste product of cellular metabolism, is expelled from the body when we exhale. This process is crucial for maintaining the acid-base balance in the body and ensuring that the cells function properly, as elevated levels of carbon dioxide can lead to respiratory acidosis and other health issues.

Other systems mentioned do not play a direct role in the removal of carbon dioxide. The digestive system is mainly involved in breaking down food and absorbing nutrients, the nervous system is responsible for transmitting signals and coordinating responses, and the urinary system primarily focuses on filtering waste products from the blood and regulating fluid balance.