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Author Question: Normal conduction begins with the pacemaker of the heart, the ________. (Read 30 times) |
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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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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.