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Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Did you know?

Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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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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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Human body: levels of organization. Human body: levels of organization.
Human Skeleton Human Skeleton
Human embryonic stem cells stained with Tra-1-60 (green) - a stem cell marker and nestin (red), a ne Human embryonic stem cells stained with Tra-1-60 (green) - a stem cell marker and nestin (red), a ne
Human anatomy and Physiology Human anatomy and Physiology
Types of tissue in the human body. Types of tissue in the human body.
Human beta-globin–complex locus control region Human beta-globin–complex locus control region
Video: Hormones and the menstrual cycle Animation

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