CELL - CELL THE BASIC UNIT OF LIFE A cell is a microscopic...

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CELL - THE BASIC UNIT OF LIFE A cell is a microscopic, structural and functional unit of living organisms capable of independent existence. (e.g. Ameba). All living things are composed of cells. Some functioning cells come together to form a tissue and tissues collectively form organs. In more complex living organisms, organs work together for the purpose of survival as system. However, in all living organisms, the cell is a functional unit and all of biology revolves around the activity of the cell. Figure 3.1 Animal Cell The study of cell is impossible without the microscope. The first simple microscope was prepared by Anton Van Leewenhoek (1632-1723) who studied the structure of bacteria, protozoa, spermatozoa, red blood cells etc. The word ‘cell’ was first coined by Robert Hooke in 1665 to designate the empty honey-comb like structures viewed in a thin section of bottle cork which he examined. He was impressed by the microscopic compartments in the cork as they reminded him of rooms in a monastery which are known as cells. He therefore referred to the
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CELL - CELL THE BASIC UNIT OF LIFE A cell is a microscopic...

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