There is large variety of living organisms around us. Each organism starts its life as a single cell. Cells have many functions which keep an organism alive. The cells is the basic structural and functional unit of all living organisms. It is the smallest unit of life and thus it is known as building blocks or basic structural unit of life. Every cell have a limited life span. Old and weak cells in the body continually die and are replaced by new cells.
Every organ in our body - the skin, the brain, the muscle or even the bone - is composed of hundreds of thousands of such cells. Similarly, every part of a plant - the leaf, the flower, the root and even the wood - is composed of an exceedingly large number of cells.As the blocks can be joined in many ways to make the building of different shapes and sizes. In the same way all , living organisms are made differently of different shapes, sizes and by different number of cells.
Cells are so small that they cannot be seen with naked eyes. So to see a cell we use a device called as microscope.
Microscope: An instrument used to see cells. Simple microscope helps to see small things but not microscopic objects. As cells are microscopic structures, are only visible under a powerful microscope like a compound microscope.
Every cell have a limited life span. Old and weak cells in the body continually die and are replaced by new cells.
The life span of different cells of the body vary differently as shown in the table.
Cell Type | Life Span |
Red blood cells | less than 120 days |
White blood cells | 13 to 20 days |
Liver cell | 200 to 300 days |
Skin epidermal cells | 2 to 4 weeks |
Cardiac cell | Long lived |
Nerve cell | Long lived |
Epithelia of small intestine | 1 week or less |
Match the following
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Right Option : B | |||||||||||||
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The term cell was given by ___________________. | |||
Right Option : B | |||
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Cell theory was given by ____________________. | |||
Right Option : A | |||
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