Which of the following correctly describes internal respiration, in which CO₂ diffuses out of peripheral tissue?
1) The process by which oxygen is transported from the lungs to the body's tissues
2) The process by which carbon dioxide is transported from the body's tissues to the lungs
3) The process by which oxygen is exchanged for carbon dioxide in the alveoli of the lungs
4) The process by which carbon dioxide is exchanged for oxygen in the body's tissues
