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The Skeletal System

AB
skeletona framework of bones
skeletal systemall the bones in your body
rib bonesprotects heart and lungs
skullprotects brain
musclesbones need these to move
marrowsoft material in bones
cartilagesofter than bone
blood vesselscarry food into the bone
red blood cellsare made in the marrow
jointshelp your body move
hinge jointswork like a door hinge
hinge jointsbend back and forth in only one direction
pivot jointsmove around and back
ball-and-socket jointmoves in all directions

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