How Different Substances Are Transported Across A Plasma Membrane
Explain how different substances are transported across a plasma membrane. You must include simply and facilitated diffusion, osmosis, active transport and bulk transport (endocytosis and exocytosis). Plasma membrane plays a vital role in every the cell by protecting the cell and all cell organelles from its surroundings. Plasma membrane is mainly composed of phospholipids and proteins and it is selectively permeable. Also plasma membrane controls what substances can enter and exit the cytoplasm. Small molecules passes easily through plasma membrane, however bigger molecules such as glucose require specific transport. In this essay I will discuss different types of plasma membrane transport. Transport can be passive or active depending on
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266 Words | 2 PagesKnowing that the concentration of different ions are not the same on the inside and the outside of the cell, yet we know that the important nature of the membrane is its permeability. The sodium-potassium pump is used to keep an osmotic balance across the membrane, by keeping the concentration of sodium ions low on the inside, because the sodium and potassium ions have the same charge, but sodium is smaller molecule and has a bigger charge density. That makes sodium more attracted to water molecules, and so the sodium will have a larger diameter, and that makes it harder to cross the inside of the membrane, that is why it is restricted from the inside. Because there is little sodium ions on the inside there has to be plentiful cations on the
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