about plasma membrane definition
plasma membrane (plasmalemma; cell membrane) The partially permeable membrane forming the boundary of a cell. It consists mostly of protein and lipid (see lipid bilayer; fluid mosaic model) and plays various crucial roles in the cell's activities. vesicles fuse with the plasma membrane releasing their contents into the extracellular fluid. intracellular fluid; surrounding the organelles; the site of many chemical reactions; energy is usually released by these reactions; reactions provide the building blocks for cell maintenance, structure, function and growth. plasma membrane. n a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell. Synonyms: cell membrane, cytomembrane. The fluid mosaic model of the plasma membrane. Protein, lipid, and carbohydrate components of the membrane. Each cell of your body is encased in a tiny bubble of membrane. This membrane has about the consistency of...salad oil1^1​1​​start superscript, 1, end superscript. Plasma Membrane Definition. Plasma membrane can be defined as a biological membrane or an outer membrane of a cell, which is composed of two layers of phospholipids and embedded with proteins. It is a thin semi permeable membrane layer, which surrounds the cytoplasm and other constituents of the cell. Fluid mosaic model. The currently accepted model for the structure of the plasma membrane, called the fluid mosaic model, was first proposed in 1972. This model has evolved over time, but it still provides a good basic description of the structure and behavior of membranes in many cells. Plasma Membrane. An Introduction to the Human Body Principles of Anatomy & Physiology 13th Edition (review of cell included) It separates the contents of the cell from its outside environment and it regulates what enters and exits the cell. Plasma membrane plays a vital role in protecting the integrity of the interior of the cell by allowing only selected substances into the cell and keeping other substances out. Cell Junctions. Integral membrane proteins of the plasma membranes also anchor cells to their environment: that is, to neighboring cells and to the proteins and glycoproteins of the extracellular environment (the extracellular matrix or ECM). Image of the plasma membrane, showing the phospholipid bilayer with peripheral and integral membrane proteins, glycoproteins (proteins with a carbohydrate attached), glycolipids (lipids with a carbohydrate attached), and cholesterol molecules.
Plasma membrane can be defined as a biological membrane or an outer membrane of a cell, which is composed of two layers of phospholipids and embedded with proteins.