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