How Does the Plasma Membrane Work On A biological Basis For the cell?
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The Plasma Membrane (PM) is very important and highly regulated part of the cell. Mainly composed of phospholipids (hydrophobic tails and hydrophilic heads) that are double layered. Also, many other components encompass the PM such as cholesterol (to keep the PM fluid), glycoproteins, and other proteins.\n\nThe PM serves as a major part of the cell's communication pathway. Serves as a barrier for communication with other cells, allows other molecules to anchor on the membrane, allows other cells to attach via cytoskeletal components, makes anchor junctions etc...with other cells.\n\nThink of the PM as the doors and windows of a home (the cell). It is quite important for these parts to be regulated. The doors allows certain people to leave to the home to interact with others, it allows people or items to come inside the home to interact. The windows allow for fresh air to come inside the home which can be regarded as quite essential for survival.
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All cells are semipermeable and depending on what passes into the cell, determines how the membrane responds to each substance. Glucose moves across the membrane, as do sodium and potassium.
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The cell membrane is a lipid bilayer made from phospholipids.  As a lipid, it is permeable to other lipids (e.g. steroid hormones) but not to polar molecules (e.g. potassium or glucose).  Polar molecules require various types of membrane proteins (e.g. potassium channels) or endocytosis (glucose) for absorption into the cell.  \n\nHope this is helpful for you.  Best wishes and good luck.
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Yes, both plant and animal cell have cell membrane. And remember without this, the onion and other things that you eat will be full of germs inside of it. And remember, cell Wall are fully permeable, they let everything pass through.
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No. The cell membranes are permeable to almost the same things, but specific carrier protein are needed for different functions, and this protein carriers are specific for some cell types.
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G'day Joanne F,\n\nThank you for your question.\n\nIt is essential if you are studying medicine to have a good understanding of how cells and tissues work. It is also useful to know how particular cells such as blood cells work.\n\nRegards
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Every cell has got organelles of self-destruction, the lysosome. These lysosomes contain a lytic enzyme, lysozyme. As lysosomes and other organelles(mostly) are enclosed in plasma membrane, lyspzyme cannot act on them.\n\nWhen a cell becomes old or worn-out, or becomes cancerous, lysosome is stimulated to release lysozyme in the form of vesicles, which bind with the plasma membrane of cell organelles and release the enzyme in the organelle, thereby lysing it.
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There are two classes of molecules that make up the cell membrane. These are  lipids and proteins.\nLipids constitute the two layers called bilyer. A lipid has two ends. One is called head and the other tail.The former is hydrophilic and the latter is hydrophobic.The lipid molecules are arrayed in such a manner that the tails face each other while the heads are away.The heads are in contact with cytoplasm on the one hand and exterior on the other.The the heads interact electrostatically with proteins. Some proteins are buried in the bilayer, and some even project beyond the bilayer on both the surfaces. Carbohydrates are over-layered, that is, on the outer side of this complex. Some lipids are phophorylated. Cholesterol is also present in some quantity in the membrane.
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pumping ions across the cell membrane requires energy which is produced by glycosis, the Krebs cycle, and Phosphorilic oxidization.  This electron transfer process yeilds a lot of ATP which is used as energy.
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CELL MEMBRANE IS THE BOUNDARY BETWEEN IT'S CELL AND IT ENVIRONMENT
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The cell membrane is a phospholipid bilayer, meaning there are two chains. Each chain has a serious of long non-polar tails (hydrophobic, hate water, non-permeable to polar molecules) with polar heads (hydrophilic, love water, permeable to polar molecules). The polar heads are on the outside of the membrane and the non-polar tails face the middle of the membrane. This structure prevents molecules from freely moving across the membrane. Embedded within the membrane are protein channels that are designed to specifically allow certain molecules through. Some of these channels open randomly, others require some kind of signal. They are selective by allowing molecules of certain size and/or charge (positive or negative) cross the membrane, also keeping in mind concentration gradients (molecules will move down their gradients). In some cases, molecules move against their gradients, but require energy to do it.
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Organ is a the correct answer but still if your wondering how it works look back in any basic biology text book where it talks about Levels of Organization.As anyliving thing unicellular to multicellular organism is based on level of organization.\nFor example, ORGANELLE-----CELLS--\n-TISSUE--ORGANs----ORGAN SYSTEM\nAs you already know Tissues are made up of cells rigth so what makes an organ is a group of tissues and in order to have organ system you need different organs a simple example is digestive system where you G.I.tract,stomach,intesitne,pancrea,liver,gall bladder all playing some important role in the functioning of the body.
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biochemistry\nClick to learn more...\nscience concerned chiefly with the chemistry of biological processes; it attempts to utilize the tools and concepts of chemistry, particularly organic and physical chemistry, for elucidation of the living system. The science has been variously referred to as physiological chemistry and as biological chemistry. Molecular biology, a term first used in 1950, is used to describe the area of research, closely related to and often overlapping biochemistry, conducted by biologists whose approach to and interest in biology are principally at the molecular level of organization. The related field of biophysics brings to biology the techniques and attitudes of the physicist. Cell biology is concerned with the organization and functioning of the individual cell and depends greatly on biochemical techniques. As the study of life forms demonstrated similar or even identical processes occurring in widely divergent species, it has taken the biochemist to unravel the underlying chemical basis for these phenomena. Biochemists study such things as the structures and physical properties of biological molecules, including the proteins, the carbohydrates, the lipids, and the nucleic acids; the mechanisms of enzyme action; the chemical regulation of metabolism; the molecular basis of genetic expression; the chemistry of vitamins; chemoluminescence; biological oxidation; and energy utilization in the cell. The study of the chemistry of the immune response offers the possibility of treatment and cure for such diseases as AIDS and lupus.\n\n   1.   The study of the chemical substances and vital processes occurring in living organisms; biological chemistry; physiological chemistry.\n   2. The chemical composition of a particular living system or biological substance: viral biochemistry.
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The plasma membrane or the cell membrane is semi-permeable.Its function is to regulate the exchange of materials between the cytoplasm and extracellular fluid.
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Cell membranes and cytoplasm are structures of all cells--both prokaryotic and eukaryotic.  Prokaryotic cells do not have any of the membrane-bound organelles, such as a nucleus, Golgi body, endoplasmic reticulum, etc.
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Cells have different shape to allow them to work better. For example, the alveoli cells are flat and big in surface, these features helps in gas exchange.
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the nucleus of the cell controls and coordinates all the work of the cell. this takes care of composition.the cell wall and the cell membrane proects the cell