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Old 07-21-2006, 11:24 AM   #1
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Interesting facts about human body

Taken from the Body Worlds 3 website.

The longest bone is the 'femur,' in the thigh. It makes up almost one quarter of the body's total height.
The smallest bone is the 'stirrup,' deep in the ear. It is hardly larger than a grain of rice.
The ears and nose do not have bones inside them. Their inner supports are cartilage or 'gristle,' which is lighter and more flexible than bone. This is why the nose and ears can be bent.
There are about 60 muscles in the face. Smiling is easier than frowning. It takes 20 muscles to smile and over 40 to frown.
The smallest muscle in the body is the stapedius, deep in the ear. It is only 5mm long and thinner than cotton thread. It is involved in hearing.
The biggest muscle in the body is the gluteus maximus, in the buttock. It pulls the leg backwards powerfully for walking and running.
The heart beats around 3 billion times in the average person's life.
About 8 million blood cells die in the human body every second, and the same number are born each second.
Within a tiny droplet of blood, there are some 5 million red blood cells, 300,000 platelets and 10,000 white cells.
It takes about 20 seconds for a red blood cell to circle the whole body.
Red blood cells make approximately 250,000 round trips of the body before returning to the bone marrow, where they were born, to die.
Red blood cells may live for about 4 months circulating throughout the body, feeding the 60 trillion other body cells.
Unlike other body cells, brain cells can not regenerate. Once brain cells are damaged they are not replaced.
The skin secretes antibacterial substances. These substances explain why you don't wake up in the morning with a layer of mold growing on your skin - most bacteria and spores that land on the skin die quickly.
Tears and mucus contain an enzyme (lysozyme) that breaks down the cell wall of many bacteria.
Lymph nodes contain filtering tissue and a large number of lymph cells. When fighting certain bacterial infections, the lymph nodes swell with bacteria and the cells fighting the bacteria, to the point where you can actually feel them. Swollen lymph nodes are therefore a good indication that you have an infection of some sort.
1.7 litres of saliva is produced each day.
Muscles contract in waves to move the food down the esophagus. This means that food would get to a person's stomach, even if they were standing on their head.
In the mouth, food is either cooled or warmed to a more suitable temperature.
At rest, the body takes in and breathes out about 10 litres of air each minute.
The right lung is slightly larger than the left.
Hairs in the nose help to clean the air we breathe as well as warming it.
The highest recorded "sneeze speed" is 165 km per hour.
The surface area of the lungs is roughly the same size as a tennis court.
The capillaries in the lungs would extend 1,600 kilometres if placed end to end.
We lose half a litre of water a day through breathing. This is the water vapour we see when we breathe onto glass.
The breathing rate is faster in children and women than in men.
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Old 07-21-2006, 11:26 AM   #2
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Old 07-21-2006, 11:28 AM   #3
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I'm going today after work at 2:15. Should be interesting.
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