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The human body plays a role in bone, joint is movement, muscle contraction is the movement.

Bone Joint Muscle2010-02-09 00:01:03 +0000 #1
Examination content acute Thank you -! ! !
a21606132010-02-09 00:06:38 +0000 #2
3 empty answer are: lever, fulcrum, and power.

Description: The role of bone in general there is movement, support, protection, but according to meaning of the questions, apparently to fill the role of bones in motion.

In fact, animal movement is to rely on the formation of leverage.
frankzane12010-02-09 00:40:21 +0000 #3
supporting role

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