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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

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People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

The dorsal (red) and ventral (blue) body cavities. The dorsal (red) and ventral (blue) body cavities.
Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t
Down Syndrome Nasal bridge Down Syndrome Nasal bridge
Colors separated by a prism into the spectrum Colors separated by a prism into the spectrum
Nasal cartilage and external structures. Nasal cartilage and external structures.
Perforated septum Perforated septum
Video: Net filtration pressure and lymph formation, edema & blood velocity

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