What controls the fight-or-flight response?
cerebral cortex
endocrine glands
activated brain synapses
sympathetic nervous system

The correct answer is the sympathetic nervous system.

Explanation:

The sympathetic nervous system controls the human body's flight-or-fight response. It is originated in the human spinal cord and this will activate the part of the brain that has the physiological impact and will then put the body into a flight-or-fight response.  

When a person suffers from acute stress or a scare the body will send signals from the spinal cord to the adrenal glands that will send the signal to the brain to activate the process. The body produces adrenaline which is them pumped through the bloodstream by the glands.

a1 = unhealthy

a2= healthy

a3= healthy

depends where it is? i got mine on my arm and from 1-10 it was a 3 different spots react differently