Membranes are thin, flexible barriers that surround cells and organelles, controlling the movement of substances in and out.
Think of membranes as the bouncer at a club. They decide who gets in and who stays out, maintaining a specific environment inside.
Lipid Bilayer: This is the basic structure of a biological membrane, composed of two layers of lipids with their hydrophobic tails facing inward and their hydrophilic heads facing outward.
Permeability: This refers to the ability of a substance to pass through a membrane. The more permeable a membrane is to a substance, the easier it is for that substance to cross it.
Transport Proteins: These are proteins embedded in the cell membrane that help move substances across it. They can be thought of as doors or gates within our club's walls.
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