cell size

[student]

how big is the average human cell? and how big is the average virus?

[biostudent84]

Big and little! Cells very in size depending on what they do. The female gamete is the only one you can see...it is the size of a period on a piece of paper. The male gamete is 100 times smaller. The sciatic nerve can be over a meter long, and runs from your back to your foot. Viruses generally are much smaller...less than any light microscope can see.

[Inuyasha]

What type of cells do you need to know the size of?

[Solid Snake]

what u should know is that cells try to stay as small as possible, this is to keep they're diameter to surface area ratio as small as possible

[2810712]

Why ,do U think , cells need to maintain size : surface area ration lower ?
I think for a particulas size of cell to carry out its functions properly it is essential to have certain value of surface area; it is essential for carrying out sufficient exchange of materials .

hrushikesh

[Poison]

But think that volume change of something is in cube form (like m3, cm3,mm3 etc...) . But area (surface area) change is in square form. (like m2,cm2,mm2 etc...).
So they must have a proper ratio to maintain optimum transport.

[thank.darwin]

A virus is around - 25-200 nm
What type of human cell?

[Poison]

the biggest human cell is egg. ( about 200-250 micron)
the smallest human cell is lymphosite(about 3-4 micron)
the longest human cell is neuron. (one of them is about 1.5 m)