Florida Basic Recruit Training Program High Liability (First Aid) Practice Exam

Which system is responsible for delivering oxygen to and removing carbon dioxide from the blood?

1. Digestive system

2. Respiratory system

3. Circulatory system

4. Nervous system

The correct answer is: Respiratory system

The respiratory system is responsible for delivering oxygen to the body and removing carbon dioxide from the blood. This system includes the nose, throat, lungs, and diaphragm, which work together to facilitate the exchange of gases. When air is inhaled, oxygen enters the lungs and diffuses into the blood through tiny air sacs called alveoli. Simultaneously, carbon dioxide, a waste product of metabolism in the cells, diffuses from the blood into the alveoli to be exhaled. This gas exchange is critical for maintaining the body’s respiratory needs and overall homeostasis. The other systems listed do not have the primary responsibility for this process. For instance, the digestive system is primarily involved in the breakdown of food and absorption of nutrients, while the circulatory system transports oxygen and carbon dioxide in the blood but does not directly facilitate the gas exchange itself. The nervous system controls many bodily functions, including breathing, but it does not perform the gas exchange necessary for oxygen and carbon dioxide removal.