The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
A model genetic system, the fern Ceratopteris richardii
The respiratory system.
Using a water-based cleaning system helps reduce the hazards from using strong chemicals.
Neurotransmitters of the Autonomic Nervous System
The Nervous System and Homeostasis
In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter. ...