Page 76 - Miracles in Our Bodies

We have explained that there are joints where bones
are connected to each other. For example, we can bend

and straighten out our arms and legs thanks to the joints

located at our elbows and knees. Although they move

throughout our lives, these joints never need to be lubri-

cated. Machines, however, need regular maintenance. For

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Finger bone
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Metacarpal
Wrist bone
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bone
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fluid
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Joint
Cartilage
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4
membrane