What does a cell membrane do (check all that apply)? Allows important materials into the cell Protects the cell Allows materials out of the cell

## Step 1<br />The cell membrane, also known as the plasma membrane, is a biological membrane that separates the interior of all cells from the outside environment. It is selectively permeable, meaning it allows certain substances to pass through while blocking others.<br /><br />## Step 2<br />The cell membrane allows important materials into the cell. This is a crucial function of the cell membrane. It allows essential nutrients, such as glucose and oxygen, to enter the cell. These nutrients are necessary for the cell to carry out its functions.<br /><br />## Step 3<br />The cell membrane protects the cell. This is another important function of the cell membrane. It acts as a barrier between the cell and its external environment, protecting the cell from harmful substances and pathogens.<br /><br />## Step 4<br />The cell membrane allows materials out of the cell. This is also a crucial function of the cell membrane. It allows waste products to exit the cell, preventing the accumulation of harmful substances within the cell.