About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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There are 20 feet of blood vessels in each square inch of human skin.
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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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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.
HEART
SHEEP HEART
Blood Flow through the Heart
Heart block
Heart Valves and Circulation of Blood
In amphibians, lizards, snakes, and turtles, the heart has three chambers: two atria and one ventric