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