A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neurohormonal control system?

1) Sympathetic nervous system activated releasing epinephrine and norepinephrine from the adrenal medulla
2) Hypothalamus activates the parasympathetic division of the brain
3) Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse
4) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from the adrenal cortex