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What are Bones? Bones are calcified connective tissue forming the major portion of the skeleton of most vertebrates. There are about 206 bones in your body. They contain more calcium than any other organ. Bones begin to develop before birth. When the skeleton first forms, it is made of flexible cartilage, but within a few weeks it begins the process of ossification. Ossification is a process where cartilage is replaced by hard deposits of calcium phosphate and stretchy collagen. It takes about 20 years for ossification to be completed. Bones are made of two types of tissue:
Bones can be donated and transplanted. Function of bones The major functions of bones are:
What are bones made of? Bones are made of protein, minerals, and vitamins. Minerals present in bones are: calcium, potassium, manganese, magnesium, silica, iron, zinc, selenium, boron, phosphorus, sulfur, chromium, and dozens of others. In order for bones to absorb the minerals, vitamin D must be present in the diet. Disease of bones Some bone diseases are: osteoporosis and arthritis. Common Injuries of bones The most common bone injury is a fracture. A fracture is a break in the bone. 4 Keys to Healthy Bones
What are Joints? Joints are places where two bones meet each other. They make the skeleton flexible. Without them, movement would be impossible. Flexible joints have a lining of cartilage on top of the bones. Ligaments join bones together and help make the joint stable. Importance of cartilage in joints Cartilage is a strong substance that allows the joint surfaces to move easily. It helps limit wear and tear on the joints? Common joint injuries The most common joint injury is a joint dislocation. A joint dislocates when the ends of bones are forced from their normal position. Dislocations are often caused by falls. They are serious and require immediate medical attention. Common joint dislocations are: shoulder, hips, and fingers.
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