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The familiar sounds of your heart are made by the heart's valves as they open and close.

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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.

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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Pupil Assessment, Move Penlight directly in Front of Pupil Pupil Assessment, Move Penlight directly in Front of Pupil
This engraving of the Boston Massacre (1770) became the most reprinted depiction of the event, and p This engraving of the Boston Massacre (1770) became the most reprinted depiction of the event, and p
A gasoline direct-injection system injects fuel under high pressure directly into the combustion ... A gasoline direct-injection system injects fuel under high pressure directly into the combustion ...
Direct immunoassays. A labeled antibody binds directly to the antigen. The label on the antibody can ... Direct immunoassays. A labeled antibody binds directly to the antigen. The label on the antibody can ...
The Many Sizes of Soft Drinks A bottle or can of soda can provide from 6 to 17 teaspoons of added The Many Sizes of Soft Drinks A bottle or can of soda can provide from 6 to 17 teaspoons of added
There Is a Difference between Natural and Added Sugars There Is a Difference between Natural and Added Sugars
Video: Hormones and the menstrual cycle Animation

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