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Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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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.

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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Location, appearance, and internal structure of the mammalian pancreas. Location, appearance, and internal structure of the mammalian pancreas.
Diabetic pancreas Diabetic pancreas
The lacrimal aparatus secretes and drains tears, which moisten and lubricate eye The lacrimal aparatus secretes and drains tears, which moisten and lubricate eye
Effects of Insulin and Glucagon on Glucose and Glycogen Effects of Insulin and Glucagon on Glucose and Glycogen
Insulin, glucagon, and blood glucose. Insulin, glucagon, and blood glucose.
Actions of glucagon in liver that lead to a rise in blood glucose Actions of glucagon in liver that lead to a rise in blood glucose
Video: Glycolysis - Introduction to ATP and the burning of sugar

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