Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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The human body produces and destroys 15 million blood cells every second.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
Brain Cell
EEG and Single-Cell Activity
Structure of a typical cell membrane
Ratio of College Wages to High-School Wages
Reproductive Cell Division: Meiosis I
Drawings depicting mitosis in an animal cell with a diploid number of 4