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Did you know?

The average adult has about 21 square feet of skin.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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.

Three types of muscle tissue: skeletal, smooth, and cardiac muscle. Three types of muscle tissue: skeletal, smooth, and cardiac muscle.
Plant Cell Types Plant Cell Types
Two types of stereoisomers Two types of stereoisomers
Summary of T-Cell Types Summary of T-Cell Types
Results of mixing blood of the same or differing ABO blood types Results of mixing blood of the same or differing ABO blood types
Types of cells involved in the inflammatory response Types of cells involved in the inflammatory response
Video: Stimulus (introduction)

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