An example of the sympathetic nervous system is if someone, who is afraid of snakes, is taking a walk in the forest and sees a snake the fight-or- flight response will take over. The sympathetic nervous system begins to pour out adrenaline. This hormone makes the pupils dilate, blood pressure increase, heart rate go up, and digestion to slow down. This enables the person to escape from the snake or if necessary stay and fight it off.
The opposite effect happens in the parasympathetic nervous system. If someone, who happens to like snakes, is taking a walk in the forest and sees a snake the rest and digest mechanism may take over. This occurs when the person feels no stress or fear. Their pupils constrict, blood pressure decreases, heart rate slows down, and digestion continues as usual.
If the sympathetic or parasympathetic nervous systems do not react and the snake is poisonous then the person could very well be bitten. The lack of response by either system could place the person in a neutral reaction situation and the snake by nature may continue to feel threatened and therefore bite them.
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