Weightlessness: a matter of gravity.
D000054:Acceleration; D000818:Animals; D001827:Body Height; D001834:Body Water / Q000502:physiology; D001835:Body Weight; D001842:Bone and Bones / Q000378:metabolism / Q000502:physiology; D002118:Calcium / Q000378:metabolism; D005118:Extraterrestrial Environment; D005260:Female; D006112:Gravitation; D006321:Heart / Q000502:physiology; D006439:Hemodynamics; D006801:Humans; D008297:Male; D009132:Muscles / Q000502:physiology; D013026:Space Flight; D013997:Time Factors; D014893:Weightlessness
D002118:Calcium