Sam is taking a walk in the woods and sees something rush past him in his peripheral vision. His heart rate increases and his pupils dilate. After realizing it was just a bunny, Sam's heart rate slows down and his body returns to normal. This process of heightened alertness requires the _____ and the return to homeostasis requires the ______
a. somatic nervous system; autonomic nervous system
b. spinal reflexes; central nervous system
c. sympathetic nervous system; parasympathetic nervous system
d. sympathetic nervous system, central nervous system
