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.
Main Content: Your arteries and high blood pressure. High blood pressure. The arteries are the large blood vessels that carry blood from the heart to all the organs and muscles of the body, to give them the energy and oxygen they need.The arteries manage the flow of blood by controlling the speed and direction it flows in.hat happens when your arteries become too narrow. The higher your blood pressure is, the greater the chance that the extra pressure could make a weak artery burst. Also, the narrower your arteries are, the greater the risk that they could become blocked.