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