What causes an increased heart rate?

physical activity and emotional turbulence, eg, if you are scared, your heart rate increases, preparing to run, this come back yet again to, physical activity

if you exercise it make your heart beat fasterthe heart is a muscle that pumps blood from the lungs after gathering oxygen from the air we breathe and sends this oxygenated blood around the rest of...

I am quite sure that it does a bit because its a penciller... its to make you relaxed but it really making your heart faster... yours truley,Noor....

Any type of exitement triggers the primative 'fight or flight'? situation in us all. Adrenalin is pumped into the blood stream in anticipation of either, the increased heart rate is part of it.

Cause of a rapid heart beat can be takardia or white parkensons wolf syndrome.