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Did you know?

About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

Strawberry hemangioma, a birthmark caused by a collection of blood vessels in the skin. Strawberry hemangioma, a birthmark caused by a collection of blood vessels in the skin.
Blood transfusion. Blood transfusion.
Causes of Blood Pressure Variations Causes of Blood Pressure Variations
Afterload is the pressure that the ventricles must overcome in order to open the aortic and pulmonic Afterload is the pressure that the ventricles must overcome in order to open the aortic and pulmonic
Comparing Blood Vessel Structure Comparing Blood Vessel Structure
Functions and Properties of Blood Functions and Properties of Blood
Video: Exocytosis - secretion

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