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The kidneys only release 3 pints (1.3 liters) of urine from every 4,400 pints (2,000 liters) of blood. The rest of the urine is reclaimed.
The knee is the most easily injured of all the joints in the body and the most frequently treated area by orthopedic surgeons, according to a report from the American Academy of Orthopedic Surgeons. More than 6 million people visit an orthopedic surgeon each year for a knee problem, the report said. Hospital emergency rooms log 1.4 million visits per year for knee problems.
The largest cell in the human body is the female ovum, or egg cell. It is about 1/180 inch in diameter. The smallest cell in the human body is the male sperm. It takes about 175,000 sperm cells to weigh as much as a single egg cell.
You will get fewer cavities if you eat a bag of candy in one sitting and then brush your teeth than if you slowly eat the candy a piece at a time all day.
Your brain is more active sleeping than it is watching TV.
Your ears pop in a plane because the cabin is pressurized for if you were at 8,000 feet not at sea level. If the cabin were set at sea level, your ears wouldn't pop, but the cabin might explode.
The left hemisphere of the brain controls language in 95 percent of right-handed people. In left-handed people, 70 percent have language controlled by the right hemisphere.
Your mouth produces a quart of saliva a day--about 10,000 gallons in a lifetime.
The left lung is smaller than the right to allow room for your heart.
Your skin weighs twice as much (six pounds) as your brain (3 pounds).
The lens of the eye continues to grow throughout a person's life.
Zigzagging across a steep hill conserves more energy than climbing straight up.
The little lump of flesh just forward of your ear canal, right next to your temple, is called a tragus.
Zoanthropy is a form of mental disorder in which the patient imagines himself to be a beast.
The liver distributes chemicals gleaned from food by the digestive system.
Zoonoses are animal diseases communicable to man.
The liver stretches across almost the width of the body, occupying a space about the size of a football. It weighs more than 3 pounds.
The longest muscle in the human body is the sartorius. This narrow muscle of the thigh passes obliquely across the front of the thigh and helps rotate the leg to the position assumed in sitting cross-legged. Its name is a derivation of the adjective "sartorial," a reference to what was the traditional cross-legged position of tailors (or "sartors") at work.
The loss of just 15 percent of the body's water can be fatal.
The lungs of an average adult, unfolded and flattened out, would cover an area the size of a tennis court.
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