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Author Question: _________________ cells differ from most other cells in that they are long and relatively thin and ... (Read 23 times) |
Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
The horizontal fraction bar was introduced by the Arabs.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.