WHY ARE MOST CELLS SMALL?

 WHY ARE MOST CELLS SMALL?

 HI friends my name is "Hadi Rana", today we will learn " Why most cells are small?".

            Most cells are cells small and can be seen only with the aid of a micro scope. One reason for the smallness is that the ratio of the volume of the cell's nucleus to the volume of its cytoplasm must not be so small that the nucleus, the cell's major control center cannot control the cytoplasm.

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         Another aspect of cell volume works to limit cell size. as the radius of a cell lengthens, cell membrane increase rapidly than cell surface area. (figure 3.3). The need of nutrients and the rate of waste production are proportional to cell volume. The cell takes up nutrients and eliminates wastes through its surface plasma membrane. If cell volume become too large, the surface area to volume ratio is too small for an adequate exchange of nutrients and wastes.

CELL MEMBRANES 

The plasma membrane surrounds the cell. Other membranes inside the cell enclose some organelles and have properties similar to the plasma membrane.

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