The heart is not controlled by anything, it is a myogenic muscle which means if you were to remove the heart from the body it would continue to beat.
However, the adrenal medulla is the part of the brain responsible for the release of adrenaline,when adrenaline is released, the SAN is stimulated to work faster and increases your heart rate, this happens when playing sports,or during a fight or flight response.
Nervous system
antiarrhythmic
Your heartbeat
the SA node
ther are no controlls
The heart controls the heart beat and the lungs control breathing
Valves have nothing to do with heart beat The pacemaker of the heart controls the heart beat
The nervous system controls the rate of the heartbeat and respiration.
heartbeat
medulla
Brain cells
medulla
It ia a specialized bit of heart tissue that controls the heartbeat.