The diagram illustrates a garden pond containing a fountain that is operated by a pump. This fountain transfers oxygen from the air to the fish in the pond. The system may be likened to part of the human circulatory system. In this comparison, the pump is like the heart. What do P and Q correspond to?
- AP: aorta; Q: pulmonary artery
- BP: pulmonary artery; Q: vena cava
- CP: pulmonary vein; Q: vena cava
- DP: vena cava; Q: aorta