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Blood is approximately twice as thick as water because of the cells and other components found in it.

Did you know?

Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Areas of Referred Pain, Anterior View Areas of Referred Pain, Anterior View
Areas of referred pain; A, anterior view; B, posterior view. Areas of referred pain; A, anterior view; B, posterior view.
A vigorous-looking Franklin D. Roosevelt campaigns for the presidency in 1932. His vice-presidential A vigorous-looking Franklin D. Roosevelt campaigns for the presidency in 1932. His vice-presidential
Vice President Richard M. Nixon and Soviet leader Nikita Khrushchev engage in a “kitchen debate” ... Vice President Richard M. Nixon and Soviet leader Nikita Khrushchev engage in a “kitchen debate” ...
Deficiency/Vice, Mean/Virtue, Excess/Vice Deficiency/Vice, Mean/Virtue, Excess/Vice
Climate change exerts societal impacts and vice versa Climate change exerts societal impacts and vice versa
Video: Blood Flow Through the Kidneys

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