system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the feeling in my stomach when i drive over a hill?
gpt
There’s a cast network of nerve connections within the body, handling messages between the spinal cord, the brain and other structures.When you hit the peak of a roller coaster and start dropping so quickly, things inside start to shift around.The liver and spleen are relatively secured by suspensory ligaments,But the intestines themselves are relatively mobile. While your body is secured by your seat belt, the organs are free to move about by some extent. That contributes to the free-fall floating sensation that either calls us back for more, or has us running to get sick from nausea.The movement isn’t only the movement of the organs, it is also the movement of what’s inside the organs.The intestines, the stomach, they hold liquid,The bladder; the same thing. It’s relatively fixed, but the fluid within those structures probably plays a role in that sudden drop.There’s no long-term danger from your organs slightly shifting around. They go back to where they started. But the movement is enough for your nerves to notice that something’s happening.