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A bilayer of phospholipids regulates cell traffic. There are five methods of transport across the membrane; diffusion, facilitated diffusion, active transport, co transpor…t and endocytosis/exocytosis.
What is the flexible covering of cells allowing exchange of materials between the cell and its environment?
the selectively permeable cell membrane
It takes place across the cell membrane
A cell's contents are enclosed by a bilayer of phospholipid molecules, each of which has a head group attracted to water and a tail repelled by it. This bilayer is called a m…embrane and regulates traffic into and out of the cell. There are five types of transport across membranes in cells: diffusion, facilitated diffusion, active transport, cotransport and endocytosis/exocytosis. Diffusion Facilitated and Active Transport Diffusion is the motion of solutes from a region of high concentration to areas of low concentration; over time, diffusion causes solutes to become evenly distributed throughout a liquid, much as a drop of dye added to a glass of water will eventually diffuse throughout the water. Cotransport, Endocytosis and Exocytosis Urea, carbon dioxide, water and oxygen are among the substances that can diffuse across cell membranes. Charged ions and many other important substances like glucose either do not diffuse across the membrane or do so very slowly. In facilitated transport, a carrier protein embedded in the membrane acts like a revolving door to permit substances concentrated on either side of the membrane to flow to the other. In active transport, by contrast, a protein uses energy to actively pump a substance across the membrane.Cotransport is a form of active transport where a membrane-embedded protein uses a concentration gradient of one substance to power the cross-membrane transport of another. If, for example, the cell pumps hydrogen ions out, it could create a high extracellular concentration of hydrogen ions and use this gradient to power inward transport of another molecule like sucrose. In endocytosis, the cell membrane envelops food particles or other molecules and takes them in as a membrane-enclosed sac. Exocytosis is the reverse of endocytosis.
across the cell membrane
So they can have food oxygen and other things from the environment
Materials are spread to different places of your body, but it depends on what material it is that determines where, but some materials stay in the blood just like you need oil… in a tank.
the cell/plasma membrane.
to get rid of waste
to get rid of wastes and take in nutrients
how cell membrane helps in maintaining equilibrium while exchangingmateials with environment