As physical activity continues beyond the first few minutes,which of the following flows into the bloodstream to signal the liver to liberate its stored energy nutrients?

Question

As physical activity continues beyond the first few minutes,which of the following flows into the bloodstream to signal the liver to liberate its stored energy nutrients?​

Quizplus · Accepted Answer

Glucagon is a hormone that is released by the pancreas when blood glucose levels are low. It signals the liver to convert stored glycogen into glucose and release it into the bloodstream. During prolonged physical activity, the body's glycogen stores may become depleted, so glucagon is necessary to signal the liver to release stored energy nutrients. Thyroxine is a hormone that regulates metabolism, but does not specifically signal the liver to release energy. Lactic acid is produced during anaerobic exercise and does not signal the liver to release energy. Insulin is produced in response to high blood glucose levels and signals cells to take up glucose, but it does not signal the liver to release stored energy. Fatty acids may be broken down for energy during prolonged physical activity, but they do not specifically signal the liver to release stored energy nutrients.

As Physical Activity Continues Beyond the First Few Minutes,which of the Following