Bones provide levers, which are
found on a fixed point. Levers are rigid rods that provide movement for your body. Bones reserve minerals that are important
to some of our body processes. In the bone there is a network of tubes called Haversian Canals that contain blood vessels
and nerves. The blood vessels carry oxygen and nutrients to the bone. The spongy bone adds strength. However, it doesn’t
add mass to it. Osteoclasts remodel the bones. The bone marrow produces red and white blood cells and platelets. Cartilage
is a protective tissue that contains protein fibers and relies on the vessels for the nutrients. A process called ossification
replaces bone cartilage when it’s damaged and begins to form seven months before a baby is born. Cartilage is found
at flexible parts, the tip of your nose, in the external part of your ear, where the ribs attach to your sternum and allows
your rib cage to move when you breath in and out. Joints are freely movable, which enables us to bend our arms and legs. Ligaments
hold our bones together in a joint.
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