by doing activities and being scared or screaming
drugs
exercise...
This usually causes the irregular heartbeat to be reset into a normal heartbeat.
Yes.
Among many other things, a heartbeat.
Blackish and burnt. :(
the best exercise is either cardio or running
too little oxygen
parasympathetic
Parasympathetic. (Apex)
incrasing metabolism increasing pump cardiac muscle to pump the blood circulation
Rapid heartbeat can be caused by many factors, some more serious than others. It can be caused by anxiety, exercise, high blood pressure or heart failure. The medical term for a rapid heartbeat is tachycardia.