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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

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A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.

Decapods, from Ernst Haeckel's 1904 work Kunstformen der Natur Decapods, from Ernst Haeckel's 1904 work Kunstformen der Natur
Local and long–distance cell communication in animals. Local and long–distance cell communication in animals.
Microscopic photo taken by Opportunity showing a gray hematite concretion, indicative of the past pr Microscopic photo taken by Opportunity showing a gray hematite concretion, indicative of the past pr
The immune system has several different components that work in concert. The immune system has several different components that work in concert.
After multiple injections of a local anesthetic, the patient developed herpetic lesions. After multiple injections of a local anesthetic, the patient developed herpetic lesions.
Where do Psychological Practitioners Work? Where do Psychological Practitioners Work?
Video: Griffith's experiments

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