How do doctors figure out what causes fainting (syncope)?
When a person faints the doctor ties to figure out what the problem is. Trying to figure out what causes the problem is a process in medicine called Differential Diagnosis. Hardi Kardi, M.D. Hardi Kardi, the son of Cheif Engineer, Mr. Kardi, is a heart doctor. He performs a very similar job to his father. How does the Alert village water supply system differ from blood circulation? First the pipes are different, in the Alert village the pipes are made from steel, not from elastic contracting tissue as the body arteries and veins in the heart. Therefore the diameter of the pipes can not change. If the mayor in the brain house needs more water he may have to change to bigger pipes or add more of them. On the other hand, the arteries going to the brain in the heart can dilate (increase their diameter), if the brain needs more blood, or they constrict (decrease their diameter), if the brain needs less blood to flow to it. Both the heart and the water pumps in the Alert Village have electri
