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Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Blood transfusion. Blood transfusion.
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Risk of Stroke and Heart Disease Increase with Increasing Blood Pressure Risk of Stroke and Heart Disease Increase with Increasing Blood Pressure
The Glycemic Index of Commonly Eaten Foods The glycemic index of a variety of foods The Glycemic Index of Commonly Eaten Foods The glycemic index of a variety of foods
Velocity of Blood Flow Velocity of Blood Flow
Branching Blood Vessels Branching Blood Vessels
Video: Digestion Animation

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