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Did you know?

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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When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

Negative control of a repressible set of genes: function of the trp repressor and corepressor in reg Negative control of a repressible set of genes: function of the trp repressor and corepressor in reg
Feedback mechanisms of the thyroid gland: (1) stimulus; (2) release of TSH; (3) release of thyroid h Feedback mechanisms of the thyroid gland: (1) stimulus; (2) release of TSH; (3) release of thyroid h
Negative feedback control of a regulated variable. Negative feedback control of a regulated variable.
Positive and negative selection during T-cell development. Positive and negative selection during T-cell development.
Negative reciprocal Negative reciprocal
Negative Feedback and Temperature Control Negative Feedback and Temperature Control
Video: Autonomic Nervous System Animation

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