The _____________ is called selectively permeable membrane.

The plasma membrane, also known as the cell membrane, is referred to as a selectively permeable membrane because it regulates the movement of substances in and out of the cell. It permits the entry of essential materials like nutrients and oxygen and facilitates the removal of waste products, while restricting the movement of harmful or unnecessary substances.

This selective permeability is a result of its phospholipid bilayer structure embedded with proteins, which allows certain molecules to pass through via diffusion, facilitated transport, or active transport. This property is crucial for maintaining the cell's internal environment (homeostasis) and supporting various cellular functions.