I have a question about diffusion of cells. Why would you expect more of a smaller cell to be diffused in the same period of time than a large cell. Is it just because the smaller ones move faster? And also why would you expect a cell with the same volume as a cubic one, but with a different surface area, to be more diffused than the cubic one?
The shape of the cell determines the surface area. The greater the surface area, the more area is available for diffusion. The equation for this is called Fick’s Law of Diffusion:
J = PA (C2-C1)
Where J is the flux due to diffusion, P is a constant, C2-C1 is the concentration difference and A is the area. So the greater the area, the greater the flux due to diffusion, and the more diffusion will occur.
Therefore, in two cells with the same volume, one cubic and one shaped irregularly, the irregularly shaped cell has a higher diffusion flux because it has a greater surface area.