What Causes The Sympathetic Nervous System To Activate?
What Causes The Sympathetic Nervous System To Activate? After the amygdala sends a distress signal, the hypothalamus activates the sympathetic nervous system by sending signals through the autonomic nerves to the adrenal glands. These glands respond by pumping the hormone epinephrine (also known as adrenaline) into the bloodstream. What increases sympathetic nervous system? Relaxation Breathing.