THE MUSCULAR SYSTEM
All over our body are a number of muscles. As children we
used to show off our strength, by bending the elbow, when the muscle gets
shortened in length and bulges out. Even
when we stand up, a number of muscles are at work. That is why we get tired,
after some time. When we walk, the muscles of the legs are very active.
Each muscle is attached to a bone. By contracting and then
enlarging, the bones are made to move.
Tendons are the threads that bind the muscle to the bone. Sawing wood by the old method, by using the
big saw, creates musclemen, whose body may not have any fat layer. In my
childhood, I have seen such giants , who are the envy of any woman! They eat
one kilo of rice at a time. Boxers are the modern type.
Muscles of the intestine work to push the food forward. Eye
lids open and close, by muscular action. Of course, the heart has strong
muscles, which work throught our life
BONES
Remove the muscles and then we see the skeleton, which is a
collection of a number of individual pieces. Some are long and some very short
as in the vertebral column. The latter is hollow in the centre. A thick cable
of nerves pass through thus tunnel, called the medulla oblongata. Cut it and
death is quick. That is why we hang the culprits or the lovers end their lives,
by wringing ht neck. Every day, millions of fowl are killed this way. The bones
are hollow and supplied by blood vessels. The pith inside produce blood
corpuscles.
The bones are made of calcium and phosphorus. Decay of cells
of the bone is called osteoporosis. In old age, bones crash easily because of
decay. Milk and eggs are necessary in old age too.
Two bones are joined at many places. To avoid friction, cartilage
tissue is placed between bones
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