the skeletal system. can you touch your backbone, your ankle bone, and your knee? these are bones...
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THE SKELETAL SYSTEM
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Can you touch your backbone, your ankle bone, and your knee?
These are bones that are all part of your skeleton.
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Just as a house could not stand without its wooden frame, your body cannot stand without its skeletal system.
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Your skeleton also protects organs inside your body, such as your brain, heart, and lungs.
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Your skeletal system also helps you move.
Muscles that move your body are attached to your skeleton.
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BUILDING STRONG BONES
Your skeletal system needs certain minerals to help it stay healthy.
Minerals, such as calcium, help build bone tissue and keep bones strong.
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One bone attaches to another bone at a joint.
Joints can be classified by the type of movement they allow.
Tissues around joints protect them. The tissues also help hold the bones together at the joint.
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Ball-and-socket joints allow the most movement of any type of joint. Your shoulder and your hip have ball-and-socket joints.The end of one bone (ball) fits into a bowl-shaped area (socket) in another bone. These joints allow your bones to have CIRCULAR MOVEMENT.
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A hinge joint lets your bones move backward and forward, the way a door moves. You can bend or straighten your leg because of the hinge joint at your knee.
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THE HUMAN SKELETON
The adult human skeleton has 206 bones.
Some of the biggest bones are labeled in the following picture:
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(pelvis)
(cranium)
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Bone with enough calcium
Bone with lack of calcium
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CALCIUM-RICH FOODS
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