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Author Question: What important development allowed sub-Saharan peoples to become farmers in a heavily forested ... (Read 27 times) |
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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.
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Everyone has one nostril that is larger than the other.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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There are 20 feet of blood vessels in each square inch of human skin.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.