Final answer:
After the aorta, the systemic circulation delivers blood to the brain first through carotid arteries, then to the kidneys through renal arteries, and finally to the liver. So, the correct sequence is Brain, Kidneys, Liver.
Step-by-step explanation:
When considering the route an oxygenated red blood cell takes after leaving the heart via the aorta, it's crucial to understand the basic circulation pattern. Blood is first pumped through the aorta, the main artery that receives blood directly from the left ventricle of the heart. The correct sequence of organs a red blood cell will pass through after leaving the heart and traveling in the aorta is Brain, Kidneys, Liver.
After exiting the aorta, the blood enters systemic circulation. Here, it perfuses various organs. The simplest way to sequence the organs mentioned in the options provided would be to consider the overall direction of systemic blood flow and the primary branches of the aorta. Since the brain receives blood just after the aortic arch through the carotid arteries, it's the first major organ to be reached. Subsequently, blood travels downward through the descending aorta to reach the kidneys, through the renal arteries. Finally, blood reaches the liver for filtering before returning to the heart. Therefore, the correct answer is B) Brain, Kidneys, Liver.