Final answer:
The blood flows from the left gastric vein through the hepatic portal system to the liver, then to the heart through the inferior vena cava, to the lungs, back to the heart, and finally through various arteries until it reaches the right ulnar artery.
Step-by-step explanation:
To trace the path of blood flow from the left gastric vein to the right ulnar artery, we must follow the path that blood takes through the circulatory system. Starting at the left gastric vein, the blood will enter the hepatic portal system and travel to the liver. From the liver, the blood flows into the hepatic vein, which drains into the inferior vena cava, and then to the right atrium of the heart.
Next, the oxygen-rich blood returns to the heart via the pulmonary veins and enters the left atrium, and then the left ventricle. The left ventricle pumps the blood into the aorta; first through the ascending aorta, then the aortic arch, and down the descending aorta.