Some ages of license are actually higher than the age of majority. For example, the age of license to purchase alcoholic beverages is 21 in all U.S. states. Another example is the voting age, which prior to the 1970s was 21, while the age of majority was 18 in most states.
The nervous system is composed of the brain and spinal cord, together known as the central nervous system, and a vast array of peripheral nerves that transmit information to and from these central structures. The nervous system may be damaged by infection, injury, vascular problems, inflammation, and degeneration.
The ANS is the part of the peripheral nervous system that acts as a control system, maintaining homeostasis in the body. These activities are generally performed without conscious control. The adrenal medulla secretes the hormone adrenaline. This hormone gets the body ready for a fight or flight response. Physiological reaction includes increased heart rate. Adrenaline lead to the arousal of the sympathetic nervous system and reduced activity in the parasympathetic nervous system.