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skelatal system

frame work of the body

ball and socket

this type of joint allows circular movement and is found in the shoulders and hips

hinge joint

joint that allows forward and backward motion (elbow)

fixed joint

a joint that does not move, found in skull only

ligament

Strong dense tissue that connects bone to bone

marrow

found inside bones where blood is made

cartilage

flexible tissue that covers and protects the ends of some bones

spongy bone

part of bone with many small pores or spaces

solid bone

the very hard part of bone that stores calcium

endoskeleton

an internal skeleton made of bone and cartilage

exoskeleton

hard protective structure developed outside the body

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