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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

Passive and active transport. Passive and active transport.
A purse made from a cane toad. A purse made from a cane toad.
Listening to loud music with headphones or at rock concerts is a frequent cause of hearing loss amon Listening to loud music with headphones or at rock concerts is a frequent cause of hearing loss amon
Cleavage with trypsin and papain separates the myosin heads Cleavage with trypsin and papain separates the myosin heads
Purse cover, from the Sutton Hoo burial ship. Purse cover, from the Sutton Hoo burial ship.
The lower intake manifold attaches to the cylinder heads. The lower intake manifold attaches to the cylinder heads.
Video: Phases of an Action Potential - Resting Potential, Threshold, Rising, Falling, & Recovery Phases

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