Final answer:
The respiratory system delivers oxygen to the body and expels carbon dioxide; therefore, the correct answer is B) Delivers; Expels.
Step-by-step explanation:
The respiratory system is an organ system that plays a crucial role in gas exchange, allowing us to take in oxygen and expel carbon dioxide. The correct answer to the question is:
The respiratory system delivers oxygen & expels carbon dioxide.
B) Delivers; Expels.
When we inhale, oxygen is drawn into the lungs and then delivered to the body's cells via the circulatory system. The body uses this oxygen for aerobic cellular respiration, which generates energy. Conversely, when we exhale, carbon dioxide—a waste product of cellular respiration—is expelled from the body into the atmosphere.