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Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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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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The familiar sounds of your heart are made by the heart's valves as they open and close.

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There are 60,000 miles of blood vessels in every adult human.

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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Locations of the thyroid and parathyroid glands. Locations of the thyroid and parathyroid glands.
Endocrine Glands/Organ Functions Endocrine Glands/Organ Functions
Parathyroid glands. Parathyroid glands.
Women can express breast milk using a breast pump Women can express breast milk using a breast pump
Skin structure. Three-dimensional view of the skin, subcutaneous tissue, glands, and hairs Skin structure. Three-dimensional view of the skin, subcutaneous tissue, glands, and hairs
ATP Production in Cardiac Muscle ATP Production in Cardiac Muscle
Video: Normal and abnormal blood pH

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