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Cellular metabolism…
depends on size
What must happen for a cell to remain functioning?
Cellular waste must leave
Dissipate thermal energy
Nutrients and other resources/chemical resources must enter
At a certain size…
it becomes too difficult for a cell to regulate what comes in and what goes out of the plasma membrane
The size of a cell…
will dictate the function
What does a cell need to optimize the exchange of material through the plasma membrane?
Needs a high surface area to volume ratio
What does the SA:V ratio mean for the cell?
Cells tend to be small
Small cells have a high SA:V ratio
→ Optimizes exchange of materials at the plasma membrane
Larger cells have a…
lower SA:V ratio
Lose efficency exchanging materials
→ The cellular demand for resources increases
→ Rate of heat exchange decreases