Which of the following sequences of blood circulation refers to pulmonary circulation?
1
Pulmonary veins → left atrium → left ventricle → aorta → arteries of different organs → venae cavae → right atrium
2
Venae cavae → Right atrium → pulmonary trunk → lungs → pulmonary veins → left atrium
3
Coronary arteries → myocardium → coronary sinus → right atrium
4
None of the above