The photograph presents an external view of the anterior side of a mammalian heart. Which row identifies where the structures labelled P, Q, R and S are located?
- AP: left atrium, Q: cardiac muscle, R: Purkyne tissue, S: pulmonary vein
- BP: left atrium, Q: left ventricle, R: coronary artery, S: vena cava
- CP: right atrium, Q: cardiac muscle, R: Purkyne tissue, S: aorta
- DP: right atrium, Q: right ventricle, R: coronary artery, S: pulmonary artery