10. What is a bone?
The human skeleton is made of bones. Bones support the body, give
shape to the body and protect the inside organs of the body like
heart, lungs. About 206 bones make up the skeleton of the average
adult. The outer part of the bone is tough and very hard.
The inside of a bone is filled with a soft material known as marrow. It
is in the marrow that the manufacture of blood cells takes place.
The outside of the bone is covered with a fibrous sheath which is well
supplied with blood vessels. There are different types of bones, each
designed to perform in different ways. Long bones forming the limbs
provide strength to support the bones that make up the structure of
the body.
Small bones found at the wrist and ankle are more squat to allow a
variety of movement.
