Pictures taken by X-ray show the bones in the patient's body. X-ray are electromagnetic rays that can penetrate different materials. They can pass through skin, fat and muscles almost unhindered, but when they reach the bones they are 'absorbed' because of the high calcium content of bones. As a result, the bones get highlighted in the image as shadows that can be clearly distinguished from the surrounding tissues. However, overexposure to X-rays is harmful for the body. For this reason, only trained persons, or specialists, conduct these tests.
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