Jim just barely avoided a head-on collision on a narrow road. With heart pounding, hands shaking, and body perspiring, Jim recognizes that these are signs of the body’s fight or flight response, which is controlled by the:

The sympathetic division of the autonomic nervous system activates the "fight or flight" response, causing symptoms like a pounding heart and shaking hands. The parasympathetic division calms the body, and the somatic division controls voluntary actions, making other options wrong.