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The familiar sounds of your heart are made by the heart's valves as they open and close.

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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

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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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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

A greater number of men than women hold full-time jobs, but the gap is closing because of an ... A greater number of men than women hold full-time jobs, but the gap is closing because of an ...
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Linesman’s pliers are very useful because they can help perform many automotive service jobs. Linesman’s pliers are very useful because they can help perform many automotive service jobs.
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Video: Miller's reaction chamber experiment Animation

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