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Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

Did you know?

Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

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Asthma cases in Americans are about 75% higher today than they were in 1980.

Paranasal sinuses are part of the upper respiratory system. Paranasal sinuses are part of the upper respiratory system.
Additional Disorders of the Skeletal System Additional Disorders of the Skeletal System
The digestive system. The digestive system.
Action of the DNA uracil repair system Action of the DNA uracil repair system
The respiratory system and the process of gas exchange The respiratory system and the process of gas exchange
The Dual Court System The Dual Court System
Video: Immune responses Animation

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