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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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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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Your heart beats over 36 million times a year.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

Sceloporus undulates, the eastern fence lizard, is one of the most widely distributed lizard species Sceloporus undulates, the eastern fence lizard, is one of the most widely distributed lizard species
Wandering Albatrosses are colonial but have large widely spaced territories. Here a pair performs th Wandering Albatrosses are colonial but have large widely spaced territories. Here a pair performs th
Cryptorchidism. (a) In complete cryptorchidism, the testes of a newborn have failed to descend into Cryptorchidism. (a) In complete cryptorchidism, the testes of a newborn have failed to descend into
Graphical Multipolar Neuron Graphical Multipolar Neuron
Worldwide Variations in Population and Income Levels Developed countries represent only 18% of the Worldwide Variations in Population and Income Levels Developed countries represent only 18% of the
The per capita emissions of the developed world The per capita emissions of the developed world
Video: Contraction cycle of a sarcomere

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