The plasma membrane maintains cell homeostasis by controlling what enters and leaves the cell.
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The cells use enzymes to work at high temperatures until the heat denatures them. The cells also maintain pH by using a blood buffering system to keep the pH from varying to much. Cells use insulin to regulate glucose in the blood. It also maintains water balance by getting rid off it through excretion.
A greater amount of osmotic pressure would be needed the lower the concentration of the solution.
A greater amount of osmotic pressure would be needed the lower the concentration of the solution.