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following articles are provided by World Book. |
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| Osteoporosis |
| Osteoporosis
(AHS tee oh puh ROH sihs), is a condition in which
bones become abnormally fragile. It is a major cause
of pain and disability in older adults. |
| Full
Article |
| Calcium |
| Calcium
(KAL see uhm), is a soft, silvery-white metallic
element found most widely in such rocks as limestone
and marble. It is one of the most abundant metals
and makes up about 31/2 percent of the earth's crust.
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Article |
| Physical
fitness |
| Physical
fitness is the ability to meet the physical demands
of daily life and to resist diseases associated
with inactivity. Physical fitness enables people
to perform well in sports and other activities,
and to look and feel their best. |
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Article |
| Joint |
| Joint
is the place at which two or more bones meet in
the skeleton of the body. This place is also called
an articulation. Joints may be fixed or movable.
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| Full
Article |
| Fracture |
| Fracture
is a broken bone. There are many kinds of fractures.
Common types include closed, open, multiple, comminuted,
greenstick, and spiral fractures. |
| Full
Article |
| Skeleton |
| Skeleton
is the flexible, bony framework of any vertebrate
animal. It gives the body shape, protects vital
organs, and provides a system of levers, operated
by muscles, that enables the body to move. |
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Article |
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