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Why Is The Plasma Membrane Called A Selectively Permeable Membrane

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The plasma membrane is called a selectively permeable membrane because it allows some substances to pass through while preventing others from passing through. The membrane acts as a barrier and gatekeeper, allowing necessary substances to enter and cell products to leave the cell while preventing the entrance of harmful material and the exit of essential material. The selective permeability of the plasma membrane is due to its structure, which is composed of a phospholipid bilayer with hydrophobic tails facing inward and hydrophilic heads facing outward.

The hydrophobic core of the membrane prevents the passage of polar molecules and ions, while the hydrophilic heads allow the passage of fat-soluble substances. Additionally, the membrane contains proteins that act as channels or pumps, allowing specific molecules to pass through in one direction.

In summary, the plasma membrane is called a selectively permeable membrane because it allows some substances to pass through while preventing others from passing through, and this selectivity is due to the structure of the membrane and the presence of specific proteins.

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