Dr. Song's accident has left her feeling 'shaky' and unsettled. DOC performs a full exam on her (as best as she can, being on the ISS) . Her blood work is normal, her blood pressure and heart rate are high. DOC asks her how she injured her leg. She cannot recall at first, but then remembers looking up after the first debris hit her helmet and seeing a fairly large chunk of space debris headed right towards her. Her first impression was that the object looked like a bear. It struck her right leg and continued on past her. Ignoring the pain, her training went to work and she had first checked her suit to make sure it was intact to protect her from the extreme environment of space - it was! Next, she remembered noticing her body's responses to this stressful event. In her mind, she compared it to a 'bear chasing her'.

Which of the following factors could contribute to her high blood pressure and heart rate?

a) Sympathetic nervous system is very active
b) Parasympathetic nervous system is very active