Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The average adult has about 21 square feet of skin.
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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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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
Development of epithelial appendages
Development of the Internal Sex Organs
A diagrammatic section through a typical adult tooth.