Final answer:
The body's process of calming down after riding a rollercoaster involves the parasympathetic response, which brings the body back to a normal, relaxed state.
Step-by-step explanation:
After riding a rollercoaster, it takes some time for the body to calm down. This process is known as the parasympathetic response. The parasympathetic nervous system activates after the fight-or-flight response, bringing the body back to a normal, relaxed state. It slows down the heart rate, constricts the pupils, restores bladder control, and stimulates the digestive system to start working again.