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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

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Everyone has one nostril that is larger than the other.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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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).

Aneurysm. Photograph of the aorta, the large blood vessel arising from the heart, with a large bulge Aneurysm. Photograph of the aorta, the large blood vessel arising from the heart, with a large bulge
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A single overhead camshaft engine with a timing belt that also rotates the water pump. A single overhead camshaft engine with a timing belt that also rotates the water pump.
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Timing of the CS and UCS Timing of the CS and UCS
Results of a cross involving two genes located on the same chromosome Results of a cross involving two genes located on the same chromosome
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