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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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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.

Back muscles Back muscles
The chief muscles of mastication The chief muscles of mastication
The major skeletal muscles—anterior superficial view. The major skeletal muscles—anterior superficial view.
Selected skeletal muscles (anterior view). Selected skeletal muscles (anterior view).
Suboccipital muscles. Suboccipital muscles.
Knead neck muscles. Use one hand to knead muscles on both sides of the neck. Knead neck muscles. Use one hand to knead muscles on both sides of the neck.
Video: Introduction to Cystic Fibrosis

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