system
Given the following post, respond as if you're commenting on Reddit:
human
How much do ones internal organs move around?

Are they more or less just dangling or floating in liquid, or are they firmly supported from all sides? Does it vary very much from organ to organ? Can you damage your other organs the same way you can damage your brain by rapid motion and impact of organ on bone, ie rib, skull(rather than just external blunt force)?  


Are there any drastic, interesting differences between certain human vs animal organs?
gpt
Most of your organs are suspended in place with their blood supply and ligaments. The most movable organ is you bowel, small intestine specifically, which slithers around But is attached to your back by the mesentery. Chest organs are all pretty much tacked in place and so are your kidneys and spleen, but they are all healed in place by ligaments as well as being positioned next to each other. That being said, they all have a bit of Wiggle room.

You can definitely injure your organ by acceleration and deceleration, that is how concussions and whiplash injuries happen. For example, if you are in rapid moving car that hit a stationary object, your head will move so fast forward then rebounds and your brain, having its own mass and only really attached at the base, can wiggle in your skull and hit forward and backward, causing a concussion or worse, a contusion, even if your head is not directly hit. 

Similar things can happen to your liver, spleen l, kidneys etc, but because these organs are squishy and more tightly packed, they don’t wiggle around as much.