Which term refers to the system that moves oxygen into the blood stream and removes CO2?

Which term refers to the system that moves oxygen into the blood stream and removes CO2?

• A. Nasal mucous membrane
• B. Sinus cavities
• C. EEG
• D. Respiratory system

Answer: (D)

Gas exchange is carried out by the respiratory system, the body system that brings in oxygen and removes carbon dioxide. It includes the lungs, airways, and breathing muscles. Oxygen you inhale travels down the airways to the alveoli, where it diffuses into the blood. Carbon dioxide moves from the blood into the alveoli to be exhaled. This continuous cycle keeps every cell supplied with oxygen and helps regulate the body's pH. The other options don’t describe this system: the nasal mucous membrane helps filter and humidify air but isn’t the whole system, the sinus cavities assist with air resonance and drainage, and the EEG measures brain activity, not respiration.