A cell may be defined as the smallest unit of structure and functions of living organisims. The word cell is
derived from latin word “cellula” meaning small room.Smallest ‘unit of structure’ means, the smallest
structures by the union of which the body of an organism is constructed.Study of structure and composition
of cell is called as “Cytology”. Cell was first observed by “Robert Hooke” in a dead cork slice in the year 1665.
He described about this in his book “Micrographia”. First living cell was discovered by A.V. Leeuwenhoek.
Protoplasm was discovered by “Felix Dujardin” and named as sarcode. The term protoplasm was coined by
Purkinje in 1839 ultrastructure (fine structure) of cell and various cell organelles in 1940s.
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