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