Which system delivers oxygen to and removes carbon dioxide from the blood?

• A. Seizure
• B. Search
• C. Respiratory System
• D. Rifle Slug

Answer: (C)

Gas exchange between air and blood is carried out by the respiratory system. This system delivers oxygen from inhaled air to the blood in the lungs and removes carbon dioxide, a waste product of metabolism, from the blood to be exhaled. In the lungs, oxygen diffuses across the thin walls of the alveoli into pulmonary capillaries and binds to hemoglobin for transport to tissues. At the same time, carbon dioxide diffuses from the blood into the alveoli to be expelled. This exchange supports cellular respiration and helps maintain acid-base balance in the body. Breathing is guided by the brainstem, which adjusts rate and depth in response to CO2 and O2 levels. So, the respiratory system is responsible for delivering oxygen to and removing carbon dioxide from the blood.