The structure in the cell that controls the movement of substances in and out of the cell is the

The structure in the cell that controls the movement of substances in and out of the cell is the cytoplasmic membrane. It is also known as the cell membrane and is a thin, semi-permeable membrane that surrounds and encloses the cell. It consists of a lipid bilayer with proteins embedded in it, and acts as a barrier to the free flow of substances in and out of the cell. The cytoplasmic membrane is responsible for maintaining the cell's internal environment by controlling the movement of substances such as ions, nutrients, and waste products. It allows some substances to pass through while preventing others from entering or leaving the cell.