👉 In biochemistry, a membracid is a type of protein that serves as an outer membrane for a cell. Membracids are responsible for maintaining the integrity and function of the cell's membrane, which plays a crucial role in regulating cellular processes such as gas exchange, nutrient transport, and cell signaling. Membracids can be divided into three main categories: intracellular membracids (also known as intracellular membranes), extracellular membracids (also known as extracellular membranes),