Final answer:
Adrenaline, or epinephrine, is the hormone that prepares the human body for an emergency by triggering a fight-or-flight response. It is secreted by the adrenal medulla and results in increased heart rate, glucose levels, and oxygen availability to key organs. The pancreas secretes insulin and glucagon to regulate blood sugar.
Step-by-step explanation:
The hormone that prepares the human body for an emergency situation is known as adrenaline, also called epinephrine. This hormone is secreted by the adrenal medulla and plays a central role in the body's short-term stress response, commonly referred to as the 'fight-or-flight' response. When released, adrenaline triggers several physiological changes such as increasing blood glucose levels, dilating the bronchioles, and increasing the heart rate, which in turn provide a burst of energy necessary for dealing with threats.
Regarding the pancreas, it secretes two major hormones that are vital in the regulation of blood sugar: insulin and glucagon. Insulin lowers the blood glucose levels by facilitating the uptake of glucose into cells, while glucagon causes the liver to release stored glucose into the bloodstream.