It is normally present in blood and urine. Insulin is produced in response to rises in blood glucose levels. The effect of dietary cholesterol on blood cholesterol levels is controversial. MafA is degraded by proteasomes upon low blood glucose levels. Fibrinogens are responsible for clotting blood to help prevent blood loss. This results in clotting of the blood. Thromboxanes are responsible for the aggregation of platelets that form blood clots. Gangrene is a type of tissue death caused by a lack of blood supply. The virus is transmitted by exposure to infectious blood or body fluids. Nitrogen dissolves in the blood and body fats. Coagulation can physically trap invading microbes in blood clots. Stabilizing them to improve drainage of fetal blood and metabolic wastes. This combination is synergistic in lowering blood pressure. There are different methods of testing and measuring blood sugar levels. This procedure is similar to that used in blood or platelet donation.