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How does filtration across cell membranes occur?

Answer 1

Large molecules are also restricted to pass through the bilayer; however, these restricted molecules pass in or out via membrane proteins in a controlled manner. The hydrophobic tails of the phospholipids block the polar molecules from entering the cell or materials such as glucose and proteins from leaving the cell.

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Answer 2

Vivian Aronson

Filtration across cell membranes occurs through passive transport mechanisms such as simple diffusion, facilitated diffusion, or active transport. These processes allow substances to move across the membrane based on concentration gradients or the use of energy.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.