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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

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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).

Transfer RNA (tRNA) Structure Transfer RNA (tRNA) Structure
Neptune’s Banded Structure Neptune’s Banded Structure
The structure of bone. The structure of bone.
A model of transcription initiation as deduced from the crystal structure of TFIIB complexed A model of transcription initiation as deduced from the crystal structure of TFIIB complexed
Characteristics of Three Forms of DNA Characteristics of Three Forms of DNA
Structure of a chromosome Structure of a chromosome
Video: Origin of organelles Animation

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