I don't mean to be blunt or dismissive, but the pressure in the veins/arteries has nothing to do with (a) the thickness/elasticity of the wall tissue, (b) the diameter of the arteries/veins, or (c) the number of (branches of) arteries/veins.
This can either be caused by a more prominent maxilla (upper jaw) or a retruded mandible (lower jaw further back than it should be). This causes a discrepancy in how all teeth contact, and can manifest as an increased overjet. An increased overjet can also be caused by a discrepancy in the number of teeth, or the length of the arch.
A malfunctioning external regulator does not disengage properly, which causes the alternator to overcharge, AA1Car.com explains. This is the part of the alternator that regulates the amount of electricity the vehicle needs to perform at varying speeds. Alternator output is another reason for overcharging. Re-manufactured and replacement alternators are larger in size and offer a higher output than stock alternators. This causes inefficiency in the pulley on the belt drive, which causes the alternator to rotate more.