The cell membrane is known as the cell membrane, the plasma membrane, or the octoplast, which is a biological membrane that separates the cytoplasm from the surrounding medium, and is defined as a two-layer lipid, and an optional permeability, as it contains the cytoplasm, and several cellular organelles consisting of lipids, and proteins arranged together Some are mosaic, and in this article we will introduce you to their function.
What is the function of the cell membrane
The cellular components are physically separated from the rest of the non-cellular components, which leads to the separation of the wall, and it regulates the exit and entry of the living cell because it is semi-permeable, and it also helps the transfer of substances across the membrane through the exchange of large amounts of chemical energy, in addition to that it acts as a connection point between the wall The cellular structure, and the cytoskeleton, which regulates the entry and exit of particles into the cell, and their exit from it.
Transport by formation of vesicles
Usually, bodies enter the cell through the plasma membrane in several ways, which are:
- Cytophagy: It is carried out by digesting the solid bodies of the cell through the natural activity of the plasma membrane, and this phenomenon is usually observed in the amoeba, where the pseudo-feet are extended around the minutes to be digested.
- Cellular drinking: is the process by which liquid substances are introduced into the cell through what is known as phagocytosis.
- Cell endothelium: This method contributes to the transfer of a large amount of materials such as stoplasm and its contents from the cell to another cell, noting that this process includes some gaps in the cell surface.
The cellular excretion is divided into several sections, namely:
- Total excretion.
- Partial excretion.
- The apical secretion.
- Binary secretion.
Cell membrane installation
The cell membrane consists of several sections, namely:
The liquid mosaic model
The plasma membrane is composed of proteins and fats that are arranged on top of each other in the form of a thin layer through many non-covalent bonds, where the ratio of proteins to the proportion of lipids depends on the type of the cell membrane in relation to other organelles, and the type of organism is defined as eukaryotic or primitive The nucleus, and it must be noted that the fat molecule consists of the polar part, which is the hydrophilic part, and the non-polar molecule, which is the non-hydrophilic part.
The polarity of the membrane
The electrical charge varies on both sides of the cell wall due to the difference in the concentration of ions between the inside of the cell surrounded by the cell membrane, and the surrounding medium, and this difference is maintained through ion channels, to contribute to the transmission of the electrical signal in a nervous, or muscular, contraction.