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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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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

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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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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

The testes. In addition to producing sperm, the testes secrete the male sex hormones, primarily test The testes. In addition to producing sperm, the testes secrete the male sex hormones, primarily test
Ovaries, uterine tubes, and uterus. Ovaries, uterine tubes, and uterus.
Ovulation Process The two ovaries alternate ovulation in each monthly cycle. Ovulation Process The two ovaries alternate ovulation in each monthly cycle.
Estrogen versus testosterone in Males as they Age Estrogen versus testosterone in Males as they Age
Endocrine Organs and the Hormones They Secrete (2 of 2) Endocrine Organs and the Hormones They Secrete (2 of 2)
Estrogen vs. BPA Estrogen vs. BPA
Video: Oogenesis Animation

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