Wednesday, 29 May 2013

Human Body

Precis writing
Human Body
Human body is a wonderful machine. It performs several  functions without rest. From the birth, our body continues to work, without stopping for a second.
 The main organs of the human body are lungs, heart, kidney, liver and brain. These organs work together which are controlled by the brain. Each system carries out a major function.
 Digestive system, excretory system, circulatory system, endocrine system, nervous system, muscular system, etc. all are controlled by the brain. The brain gives' us intelligence to use our physical and mental abilities. The body has more than 50,000 living cells of two hundred different types. These cells include neurons (nerve cells) and glands (specialized cells).
 The hormones and enzymes are produced and secreted by these glands. Each types of cells perform different functions. Cells doing similar job are grouped to form tissues. The tissues group together in a special manner to from organs.
 The human body is covered by the skin. Skin is a flexible covering which protects the body. It keeps water and harmful germs out. It is wear resistant. The body's strong internal framework (skeleton) is made of 206 bones. These are connected at the joints, such as in legs. These joints help us to move. The backbone supports the head and limbs and protects the spinal cord. Between the skeleton and skin there are about 60 muscles. Nerves spread from the brain to all parts of the body. They carry signal in the from of tiny electrical impulses. The sense organs, namely, eyes, nose, ears, tongue and skin, pass the message to brain through nerves. They take the instructions from brain to muscles. The brain automatically controls breathing, heartbeat, digestion, etc. The body keeps on growing. The peak of physical growth is reached at about 18 to 25 years of age. When we grow old the skin becomes wrinkled and less elastic. The joints become flexible, muscles loose, bones become weak. At the climax of life, the body gives up and death occurs.Human body is a most valuable gift of the God to human being. A healthy body contains a healthy brain. A healthy brain contains a healthy soul. As such, it is very important to take care of our body. For this regular exercise, control over eating habits, cleanliness of body and discipline are essential in daily life.

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