sympathetic
The most common reason is stress and anxiety but of course streneous exercise can contribute..if it happens for no apparent reason its smart to have it checked out
Your diet you fat dick!
sympathetic. Apex
Crystal Meth and Cocaine
No, adderall is taken for ADD and ADHD its like speed for people without ADD or ADHD if you have anxiety do not take adderall it will make your heart race and you will be going a million miles and hour and you will not be able to calm down.
Caffeine is the primary chemical in coffee that causes the heart to race and make one 'hyper.'
Cardio myo
The 'fight or flight' system also called the sympathetic system causes this response.
The demented Hitler tried in vain to create a superhuman race
The human race didn't create it, it is just survival of the fittest. Although the human race made it more organized.
Ego.
Inequality, and unjust treatment of minorities, are the root causes of the race riots that have occurred in the U.S.