a. Write Short Notes : Human body : A wonderful Machine
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Answer:
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. ... Each system carries out a major function, digestive system, excretory system, circulatory system, endocrine system, nervous system, muscular system, etc.
Answer:
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 (cells). The hormones and enzymes are produced and secreted by these glands. Various types of cells perform different functions. Cells doing similar job are grouped to form tissues. The tissues group together in a special manner to form 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 war resistant. The body’s strong internal framework (skeleton) is made of 206 bones. These are connected at the joint, 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 500 muscles. Nerves spread from the brain to all part of the body.
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