A 72-year-old woman dies after a strock. At autopsy, a large embolus is found in the brain. this embolus mostlikely formed in which of the following blood vessels?
A) Right coronary artery
B) Right hepatic vein
C) Right renal vein
D) Superior vena cava
E) Right pulmonary vein
Answer: Right pulmonary vein
Explanation: The embolus must be able to travel to the brain without passing through a capillary bed. Thus, it can only have been formed in the right pulmonary vein. Other possible answers would be the left atrium or left ventricle, but these are not choices.