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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Internal view of the heart with aorta, vena cava, and pulmonary arteries and veins. Internal view of the heart with aorta, vena cava, and pulmonary arteries and veins.
The surface of the human brain The surface of the human brain
Levels of Ghrelin in Human Blood Plasma Levels of Ghrelin in Human Blood Plasma
Human Lungs (Respiratory System) Human Lungs (Respiratory System)
Staphylococcus aureus cells (yellow) stuck in mucus secreted by human nasal epithelial cells. Staphylococcus aureus cells (yellow) stuck in mucus secreted by human nasal epithelial cells.
Major blood vessels of the human cardiovascular system Major blood vessels of the human cardiovascular system
Video: How Hemoglobin Picks Up and Delivers Oxygen

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