The drugs are normally prescribed to treat attention deficit hyperactivity disorder (ADHD), but healthy students use them to get a leg up in school, by improving focus, concentration and memory.
Adrenaline, or epinephrine, is a hormone that dilates an individual's air passages and increases his heart rate when he is faced with a stressful situation. The hormone is secreted from the adrenal glands to help ensure survival under dangerous situations.
Through interaction with. the nervous system, the endocrine system plays a role. in the control of metabolic activity through the release. of hormones (chemical messengers) into the blood and. lymph. Compared to the nervous system, the endocrine. response is sustained longer than those initiated by the. nervous system.