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The concentration of A is as the concentration increases on the cell's outside, it would decrease inside.
Facilitated diffusion is the process by which molecules move across the plasma membrane with the aid of membrane proteins like channels and carriers.
These molecules move down a concentration gradient, which gives them the potential to diffuse into (or out of) the cell. They cannot, however, pass the phospholipid portion of the membrane on their own because they are charged or polar. These molecules are protected from the hydrophobic center of the membrane by facilitated transport proteins, which also provide a pathway for their passage.
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The concentration of A would drop inside the cell as the outside concentration would increase.
Passive diffusion is the most basic method for molecules to penetrate the plasma membrane. A molecule simply dissolves in the phospholipid bilayer during passive diffusion, diffuses through it, and then dissolves in the aqueous solution on the opposite side of the membrane.
Water will therefore diffuse along its gradient of concentration and cross the membrane to the side where it is less concentrated. Osmosis, the process of water diffusing through a membrane, will keep going until the water's concentration gradient is zero. Living systems continually undergo osmosis.
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