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Many children occasionally walk in their sleep. Sleepwalking is ordinarily a phase in the growing-up process. Because parts of the child's brain are immature, dreams can be stimulating enough to cause a youngster to take a nocturnal stroll. About 25 percent of all children have one or more sleepwalking episodes between the ages of 7 and 12, according to sleep researchers.
Medical experts are perturbed that TV medical dramas suggest that people who receive CPR usually recover; the truth is, only about 15 percent of victims survive after receiving CPR.
Medical experts have observed that people who stutter rarely do when they are alone or talking to a pet.
The body has 70,000 miles of blood vessels. The heart pumps blood through this labyrinth and back again once every minute.
The body has around 60 million cells in it. Each cell has its own task to do in the body.
The body has three types of cartilage: Hyaline: almost clear, it is found in joints and ribs: fibrous: firm, it is found around the knee; and elastic: flexible, it is used in airways, noses, and ears.
Medical experts warn that compulsive exercising can be just as bad for a person as no exercise at all. The human body needs 24 hours without exercise about once a week in order to cleanse itself of lactic acid and other waste products of strenuous activity.
The body has three types of muscles: skeletal muscle, cardiac muscle, and smooth muscle. Skeletal muscles you can control, while cardiac and smooth muscles work on their own.
Men can have 8 million genetically different sperm, and women a like number of egg types. Together they can produce 64 billion children with no genetic duplicates.
The body is supported by the skeleton, which also serves to protect the internal organs.
Men have more blood than women. Men have 1.5 gallons as compared to 0.875 gallons for women.
The body requires 20 amino acids to form the protein needed to make and repair cells. Twelve amino acids can be made by the body, but the other 8 must be obtained from food.
Men over the age of 24 shave an average of six times a week.
The body's daily requirement of vitamins and minerals is less than a thimbleful.
Men reach the peak of their sexual powers in their late teens or early twenties, and then begin to slowly decline. Women, however, do not reach their sexual peak until their late twenties or early thirties, and then remain at this level through their late fifties or early sixties.
The body's largest internal organ is the small intestine at an average length of 15 to 20 feet and has a diameter of no more than an inch and a half. The large intestine measures an average of 5 feet.
Men who take steroids to build muscle are believed to have extremely low sperm counts. So reported the British Centre of Reproductive Medicine study, which revealed that, after giving up steroids, it takes one to three years for a man to recover enough to father a child.
The bones in the human body are comprised of 22 percent water.
Men with mustaches may be allergic to their own lip hair. That is because mustaches may harbor airborne pollens that trigger allergies.
The brain gets its intelligence from a surface layer of tissue no more than a quarter of an inch thick. Called gray matter, it contains about 8 billion nerve cells interlinked by some 10,000 miles of nerve fibers for each cubic inch.
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