After hearing odd scratching and growling sounds in the dark alley by which she had to walk, Julie's blood pressure increased and her heartbeat quickened. Once she quickly realized it was just a cat, her heartbeat and blood pressure went back to normal. These normalizing/calming physical reactions were most directly regulated by her _____________________.
a. parasympathetic nervous system
b. sympathetic nervous system
c. somatic nervous system
d. sensorimotor nervous system
a. parasympathetic nervous system
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