After being startled awake in the middle of the night, it turns out that the noise that Corrine heard was the closet rod breaking from the weight of her winter coats. Knowing that, Corrine begins to calm down and her heart stops racing. Clearly Corrine's _____ nervous system has now been activated.

According to my research on studies conducted by various medical professionals, I can say that based on the information provided within the question it seems Corrine's parasympathetic nervous system has been activated. This is a system that conserves energy as it slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles in the gastrointestinal tract. Which is why her heart stopped racing.

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