Ultrasound imaging of the breast uses sound waves to produce pictures of the internal structures of the breast. It’s primarily used to help diagnose breast lumps or other abnormalities your doctor may have found during a physical exam, mammogram or breast MRI. Ultrasound is safe, noninvasive and does not use ionizing radiation.
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It's basically the percentage of body fat, muscle and bone. You can change it by exercising a lot (cardiovascular in particular), eating less calories (dieting) or just eating more healthy things/ more foods with protein.
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I had a question like this on a health/pe test last week
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c. Jordan has learned to hit the machine because she has seen other people hit vending machines when their money is eaten.