An immune response occurs when antibodies, which are proteins in your immune system, are summoned to attack an antigen. When you say you are blood type A, what you are telling people is that the cells in your body make antibodies only to type B antigens.
Best Answer: Blood pressure elevates when the arterioles constrict, which increases the volume carried in the larger arteries, which increases the pressure exerted against the interior walls of those arteries.When vessels constrict, they tighten, and reduce the amount of space inside.ee constrict think choke. Constricting arteries mean the diameter of the hollow part of the arteries where the blood flows is getting smaller. This generally increase blood pressure. When the blood vessel dilates, the diameter increases, lowering blood pressure.
High blood pressure, or hypertension, is a blood pressure reading of 140/90 or higher. Years of high blood pressure can damage artery walls, causing them to become stiff and narrow.This includes the arteries carrying blood to the heart. As a result, your heart cannot get the blood it needs to work well.This can cause a heart attack. A blood pressure reading of 120/80 to 139/89 is considered prehypertension. This means that you don't have high blood pressure now but are likely to develop it in the future.igh blood pressure, or hypertension, is a blood pressure reading of 140/90 or higher. Years of high blood pressure can damage artery walls, causing them to become stiff and narrow.