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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.

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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

No Smoking No Smoking
The proportion of men and women with elevated blood pressure or taking hypertension medication incre The proportion of men and women with elevated blood pressure or taking hypertension medication incre
Carrie Mae Weems, Untitled (Man Smoking/Malcolm X), from The Kitchen Table Series. Carrie Mae Weems, Untitled (Man Smoking/Malcolm X), from The Kitchen Table Series.
This couple, a brother and sister in Germany and the proud parents of this child, are challenging ... This couple, a brother and sister in Germany and the proud parents of this child, are challenging ...
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Video: EpiPen Animation (Part 1)

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