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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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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

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Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

Schematic of typical animal cell depicting the various organelles and structures. Schematic of typical animal cell depicting the various organelles and structures.
Cell division protein FtsN Cell division protein FtsN
Electrical charge of the inner and outer regions of nerve cells Electrical charge of the inner and outer regions of nerve cells
Mechanism of penicillin: (a) Bacterial cell wall strengthened by peptide cross-links. (b) Penicillin ... Mechanism of penicillin: (a) Bacterial cell wall strengthened by peptide cross-links. (b) Penicillin ...
Over time, cells acquire mutations. Two independently acquired mutations in the same cell may be suf Over time, cells acquire mutations. Two independently acquired mutations in the same cell may be suf
A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin
Video: Hormonal regulation of pregnancy - week 1

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