what is the regulation of heart rate
By this activity the nerve slows the heart rate down and deceases BP back to normal. When the body is in fear or stress the hormone called adrenaline is releases, this makes the heart rate to work faster by boosting the effect of the sympathetic nervous system. When the heart rate is increased the heart beat then also started beating faster. For example when the body produces too much of carbon dioxide, breathing rate increases so to get the breathing level back to normal homeostatic slows or stops breathing.