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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

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Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.

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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.

Tight junctions between adjacent intestinal cells Tight junctions between adjacent intestinal cells
Varicosis. (a) Varicose veins develop due to the failure of valves in the superficial veins of the l Varicosis. (a) Varicose veins develop due to the failure of valves in the superficial veins of the l
Bone Canals Bone Canals
Hyoid Bone Hyoid Bone
If the solubility of helium is 0.94 cc per 100 cc of blood at 1.00 atmosphere, w If the solubility of helium is 0.94 cc per 100 cc of blood at 1.00 atmosphere, w
Polytene chromosomes derived from larval salivary gland cells of Drosophila Polytene chromosomes derived from larval salivary gland cells of Drosophila
Video: The Hypothalamus: The Body's Thermostat (Human Thermostat)

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