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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

The internal organization of cells, tissues, organs, and organ systems in a mammal. The internal organization of cells, tissues, organs, and organ systems in a mammal.
Brain Cells Brain Cells
Gram-stained bacteria on a microscope slide. (A) Red rod-shaped cells are Escherichia coli (Courtesy ... Gram-stained bacteria on a microscope slide. (A) Red rod-shaped cells are Escherichia coli (Courtesy ...
Cytotoxic T cells Cytotoxic T cells
Glands and Cell Types of the Colon Glands and Cell Types of the Colon
Schematic illustration of the morphologic changes in cell injury culminating in A necrosis or B apop Schematic illustration of the morphologic changes in cell injury culminating in A necrosis or B apop
Video: Control of ventilation rate by other brain centers (posts, hypothalamus & cerebral cortex)

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