Adrenaline

Adrenaline is a hormone action, secreted by the adrenal glands in response to a hazardous situation.
Adrenaline acts mainly on muscle, adipose tissue and liver. Begins to secrete in a matter of seconds, but a peak occurs when you reach the moment of production. Its effectiveness lies between one and three minutes and has the ability to increase the body's normal metabolism as much as 100 percent.
Given the risk, the adrenal glands secrete adrenaline, which relaxes the muscles of the airways to allow more air to enter the lungs, stimulates the heart and makes it beat faster and harder, the pupils dilate to increase the ability to observe, the respiration rate increases and slows the digestive system so that more blood to enter the muscles, which increases stress and blood pressure.