muscles
brains
legs
hands
torso and head
lungs
stomach
legs and arms
zero gravity
microgravity
regular gravity
interacting
eating
talking
walking
their sense of balance gets worse
their sense of balance doesn’t change
their sense of balance gets better
sleeping sickness
food poisoning
migraines
motion sickness
it swells with fluid before shrinking
it slows down
it speeds up
nothing, it stays the same