YMCA Level 3 Qualifications Practice Test

Glucagon is the hormone released in response to low blood sugar levels. When blood glucose levels drop, glucagon is secreted by the alpha cells of the pancreas. Its primary role is to stimulate the liver to convert stored glycogen into glucose, which is then released into the bloodstream. This process helps to raise blood sugar levels back to normal.

Understanding the function of glucagon is crucial for comprehending how the body maintains homeostasis. In contrast, insulin, which is produced by the beta cells of the pancreas, lowers blood sugar levels by facilitating the uptake of glucose into cells. The roles of cortisol and adrenaline are more related to the body's response to stress and can influence blood sugar levels indirectly, but they are not specifically released for the purpose of correcting low blood sugar. Thus, glucagon is the correct answer as it directly acts to counteract low blood sugar by increasing glucose availability in the bloodstream.