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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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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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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

The nucleus and endomembrane system The nucleus and endomembrane system
Overview of blood flow through vessels in a closed circulatory system. Overview of blood flow through vessels in a closed circulatory system.
Human Visual System Human Visual System
Structures of the respiratory system. Structures of the respiratory system.
Major Degenerative Diseases of the Central Nervous System Major Degenerative Diseases of the Central Nervous System
Some vehicles will display a message if an evaporative control system leak is detected that could ... Some vehicles will display a message if an evaporative control system leak is detected that could ...
Video: How Hemoglobin Picks Up and Delivers Oxygen

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