When you become alarmed, your division activates the flight-or-fight procedure priming the body for action. once the emergency has ended, the division lowers your heart rate, stops your sweating, and returns your body to the state before you became alarmed.

sympathetic , parasympathetic

Explanation:

         The autonomic nervous system have primarily two divisions in the body. One is the sympathetic nervous system division and the other is the parasympathetic nervous system division.

          The sympathetic division of the nervous system activates what is often called as the flight response or flight. It operates through a series of neurons that are interconnected to each other. the prolonged activation of the sympathetic division can obtain the release of adrenaline from adrenal medulla. Thus it prepares the body for any action.

          Where as the parasympathetic division of the nervous system lowers the adrenaline rush in the body and the excitation effect of the sympathetic part and restores the body's energy supplies.

i think its toxic gasses but i could be wrong