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