Cell

• Study of Cell is called as Cytology
• "Cell is known as basic structural and functional unit of all Organisms or Living beings (Life) "
• human body exists nearly 10 /\ 14 (10 to power 14) Cells.
• Cell was Invented by => Robert Hook (in 1665) {He was discovered dead cell in Bark of Cork}
• Cell has been made from a life saving substance called as Protoplasm {Protoplasm is the physical base of the life and in Protoplasm nearly 80% water is found}
• Protoplasm was discovered by => J. E. Purkinje (in 1939)
• Protoplasm is also of two types- 
• Nucleoplasm - (Present inside the nucleus)
• Cytoplasm - (Present between nucleus and cell membrane)

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Cell Theory:

• Cell theory was given by Schelder and Schwann (in 1838-39)
• Important points regarding cell theory:

1. Every organisms originates from a cell.
2. Each cell arises from preexisting cell.
3. Cell is self independent unit, it takes part in metabolic activities.
4. Core of the cell is nucleus. 

Some Important Points

* Smallest Cell => Mycoplasma gallisepticum * Largest  Cell => Egg of Ostrich (Weight - 1250 gm) * Longest Cell => Nerve Cell (Length up to 1 m)\ * Biggest single cell organism => Acetabularia

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