- the aorta and vena cava
- the aorta and pulmonary vein
- the aorta and pulmonary artery
- the pulmonary vein and vena cava
- the pulmonary artery and vena cava
Number 3 is correct.
During ventricular systole, blood enters the aorta and the pulmonary artery. The other options do not correctly explain which vessels the blood enters during the ventricular systole phase of the cardiac cycle.