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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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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

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Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

A comparison between chromosomes found in a normal human cell and a cancer cell from the same person A comparison between chromosomes found in a normal human cell and a cancer cell from the same person
Cambrian trilobite, with a shell made of calcium carbonate. Cambrian trilobite, with a shell made of calcium carbonate.
In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con
When Union troops pushed toward Richmond in June of 1862, these slaves crossed the Rappahannock Rive When Union troops pushed toward Richmond in June of 1862, these slaves crossed the Rappahannock Rive
A well-folded letter fits easily into the envelope and is easily removed by the person who receives ... A well-folded letter fits easily into the envelope and is easily removed by the person who receives ...
Commercially made peanut butter doesn’t have any detectable levels of trans fatty acids Commercially made peanut butter doesn’t have any detectable levels of trans fatty acids
Video: Stroke volume - preload, sarcomere length and Frank -Starling law

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