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There are 20 feet of blood vessels in each square inch of human skin.

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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 word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Plastid composition of egg cells from green, white, and variegated four-o'clock plants. Plastid composition of egg cells from green, white, and variegated four-o'clock plants.
This white pine (Pinus strobus), towering above the canopy in Algonquin Provincial Park, is an examp This white pine (Pinus strobus), towering above the canopy in Algonquin Provincial Park, is an examp
he White-throated Bee-eater, Merops albicollis is a near passerine bird in the bee-eater family Mero he White-throated Bee-eater, Merops albicollis is a near passerine bird in the bee-eater family Mero
white bengal tiger white bengal tiger
Gray matter and White matter Gray matter and White matter
Video: Fetal Development of the Cardiovascular System

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