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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

sperm whale, Physeter macrocephalus sperm whale, Physeter macrocephalus
Sperm in the fallopian tube. Sperm in the fallopian tube.
The winning sperm The winning sperm
Depiction of the homunculus, a sperm containing a miniature adult Depiction of the homunculus, a sperm containing a miniature adult
Where and how sperm form. Where and how sperm form.
Structure of a mature sperm, a male gamete. Structure of a mature sperm, a male gamete.
Video: Structures that affect circulation - arterioles and vasomotor responses

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