Different kind of cells.

THE SIZE OF CELL IS DETERMINED BY TWO MAIN FACTORS.

• its requirement of nutrients and oxygen .
• The regulating ability of its nucleus.      

TWO IMPORTANT CONTRIBUTE TO CELL SIZE.

• nucleocytoplasmic Ratio 
• surface area of cell.
• size of cell has no relation with the size of Organisms body.
• In unicelled organisms generally the surface volume ratio is low..                                                                                                 

CELLS WITH THEIR VARYING SIZES.

1. Smallest cell of human body =Sperm cells and Kidney cells.
2. Largest cell=Human egg.
3. Longest cell=Nerve cell.
4. smallest cell=Nerve cell(0.1-0.5)micrometer,other name is PPLO(Pluero pneumonia like organisms)or MLO.They are cell wall less .They are Prokaryotes and belong to kingdom monera.
5. Smallest bacteria =Dialister Pneumosintes.
6. smallest cell with cell wall = Bacteria.
7. Largest cell in animal kingdom=Ostrich.
8. Largest unicelled plant = Acetabularia( 9-14cm)found by Hammerling .It is a green alagae.
9. The longest cells in the human body are the motar neuron,they can be upto 4.5feet long run from the lower spinal cord to the big toe.
10. Largest animal cell egg of the ostrich.
11. Size of humsn egg = largest not longest.
12. Longest plant  cell =Fibre of Ramie(55cm) Boehmiria nivea (Urticaceae).
13. Longest animal cell=Nerve cell (90cm).
14. Largest prokaryotic cell =Spirillum Volutans(15micrometer).
15. Size of human RBC 7.5micrometer.

Smalller cell have more surface area per volume ,the smaller cells have more surface volume ratio , more surface area as compare to volume, and have more nutrient uptake.