Plasma or cell membrane is the membrane that surrounds the cell, separating the external environment from the cytoplasm and controlling what enters and leaves the cell.
The models of both the plant and animal cells is attached in diagram below. The shaded dark area is the plasma or cell membrane.
From the model given, the plasma membrane is located at the outer part of the cell. Therefore, it controls what enters and leaves the cell.
This is because is the membrane is made up of lipid bilayer.
This allows only the movement of non polar small substances across the membrane in a direction against their concentration gradient.
Therefore, plasma membrane contributes to how the cell function as a whole by controlling the materials that are transported in and out of the cell.
Learn more here:
https://brainly.com/question/734740
