2025年1月15日 · Cell membrane, thin membrane that surrounds every living cell. The cell membrane functions as a barrier, keeping cell constituents in and unwanted substances out, and as a gate, allowing transport into the cell of essential nutrients and movement from the cell of waste products.

2023年2月2日 · The cell membrane, also called the plasma membrane, is a thin layer that surrounds the cytoplasm of all prokaryotic and eukaryotic cells, including plant and animal cells.

2023年7月18日 · Cell membranes are an essential component of the cell, providing separation between the intracellular and extracellular environment. They are composed of lipids, proteins and carbohydrates.

2020年10月19日 · The cell membrane gives the cell its structure and regulates the materials that enter and leave the cell. It is a selectively permeable barrier, meaning it allows some substances to cross, but not others.

2023年8月3日 · There are two types of cell membrane. They are: Cytoplasmic membrane: which surrounds the whole protoplasm. Internal membrane: which surrounds various cellular organelles and vacuoles. Inside constituents are proteins, carbohydrates and, nucleic acids. They are usually large in size. They are soluble in water and consists of charge.

The fundamental structure of the membrane is the phospholipid bilayer, which forms a stable barrier between two aqueous compartments. In the case of the plasma membrane, these compartments are the inside and the outside of the cell.

The cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates and protects the interior of a cell from the outside environment (the extracellular space). [1][2] The cell membrane consists of a lipid bilayer, made up of two layers of phospholi...