Answer:
A) heart rate to decrease.
Step-by-step explanation:
The parasympathetic nervous system generates rest and digest response to restore the energy level of the body after fight or flight response from the sympathetic nervous system. The parasympathetic nervous system works antagonistically to the sympathetic nervous system and slows down the heart rate.
Axons of parasympathetic motor neurons in the vagus nerve supply organs and tracts such as lungs, heart, glands of the gastrointestinal (GI) tract, and smooth muscle of the respiratory passageways, etc. The output from the cardiovascular center flows along sympathetic and parasympathetic axons. The parasympathetic impulses propagated along vagus nerves serve to decrease heart rate.