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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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There are 20 feet of blood vessels in each square inch of human skin.
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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).
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Thyroid conditions may make getting pregnant impossible.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
![The conduction system of the heart; traces the path of the electrical impulse that stimulates the he](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_22_09_85202259.jpeg)
![Inline four-cylinder engine showing principal and nonprincipal ends. Normal direction of rotation is ...](https://biology-forums.com/gallery/29/medium_548020_25_05_17_1_02_50_2932579.png)