How does the body primarily respond to low blood glucose levels?

The body's primary response to low blood glucose levels involves the release of glucagon and epinephrine. When blood glucose levels drop, glucagon is secreted by the alpha cells of the pancreas. This hormone signals the liver to convert stored glycogen into glucose and release it into the bloodstream, effectively raising blood glucose levels.

In addition to glucagon, epinephrine (also known as adrenaline) is released from the adrenal glands during stress or low energy conditions. Epinephrine enhances the mobilization of glucose by promoting glycogenolysis and gluconeogenesis in the liver and inhibiting insulin secretion. Together, these hormones work to elevate blood glucose levels to ensure that the body, particularly the brain and muscles, has sufficient energy to function properly. This adaptive response is crucial, especially during situations of fasting, prolonged exercise, or stress.

The other options do not represent the body's correct response to low blood glucose. Insulin, for instance, is released when blood sugar levels are high to facilitate the uptake of glucose by cells. Decreasing metabolic activity would not effectively address low glucose levels as it would further decrease energy availability. Increasing thirst is not a direct physiological response to low glucose levels; it is more often associated with dehydration or certain hormonal imbalances