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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

Painting of a Colonial American boy holding a pet squirrel. Painting of a Colonial American boy holding a pet squirrel.
The Punnett square demonstrates how the F2 ratio arises from an F1 x F1 cross. The Punnett square demonstrates how the F2 ratio arises from an F1 x F1 cross.
Hong Kong is a strange situation. A British colony since 1842, it was handed back to China in 1997 a Hong Kong is a strange situation. A British colony since 1842, it was handed back to China in 1997 a
WALL PAINTING WITH HORSES, RHINOCEROSES, AND AUROCHS WALL PAINTING WITH HORSES, RHINOCEROSES, AND AUROCHS
Describe the development of atherosclerosis, including its role in the risk of heart disease Describe the development of atherosclerosis, including its role in the risk of heart disease
An 1809 painting showing a wounded soldier as he lay dying of tetanus in a military hospital An 1809 painting showing a wounded soldier as he lay dying of tetanus in a military hospital
Video: Heart Chambers

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