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    ~*~Amazing Facts About the Human Body~*~

    ---Rose---
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    • Post n°1

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    Post  ---Rose--- Thu Sep 24, 2009 4:34 am

    The Skeletal System


    • The largest bone is the pelvis, or hip bone. In fact,
    it is made of six bones joined firmly together.
    • 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 end of the 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.
    • After death, cartilage rots faster than bone. This is
    why the skulls of skeletons have no nose or ears.
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    Post  ---Rose--- Thu Sep 24, 2009 4:36 am

    The Circulatory System


    • The heart beats around 3 billion times in the average
    person’s life.
    • About 2 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 1 minute 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.
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    Post  ---Rose--- Thu Sep 24, 2009 4:38 am

    The Muscular System

    • 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 longest muscle in the body is the sartorius, from
    the outside of the hip, down and across to the inside
    of the knee. It rotates the thigh outward and bends
    the knee.
    • 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, running and climbing steps.
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    Post  ---Rose--- Thu Sep 24, 2009 4:40 am

    The Nervous System


    • The brain looks like a giant, wrinkled walnut.
    • Unlike other body cells, brain cells can not regenerate.
    Once brain cells are damaged they are not replaced.
    • The brain and spinal cord are surrounded and
    protected by cerebrospinal fluid.
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    Post  ---Rose--- Thu Sep 24, 2009 4:41 am

    The Respiratory System


    • At rest, the adult body takes in and breathes out
    about 6 liters 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
    kilometers if placed end to end.
    •We lose half a liter of water a day through breathing.
    This is the water vapor we seen when we breathe
    onto glass.
    • A person at rest usually breathes 12 and 15 times a
    minute.
    • The breathing rate is faster in children and women
    than in men.
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    Post  ---Rose--- Thu Sep 24, 2009 4:43 am

    The Digestive System

    • Adults eat about 500 kg of food per year.
    • 1.5 liters of saliva are produced each day.
    • The esophagus is approximately 25 cm long.
    • 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.
    • An adult’s stomach can hold approximately 1.5 liters
    of material.
    • Every day 11.5 liters of digested food, liquids and
    digestive juices flow through the digestive system,
    but only 100 mls of fluid are lost in feces.
    • In the mouth, food is either cooled or warmed to a
    more suitable temperature.
    •We get two sets of teeth. Our 20 “Baby Teeth” are replaced
    starting at around 6-7 years of age with our 32
    “Adult Teeth.”
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