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Cell Membrane
The outer boundary of a cell that separates the cell from its environment.
Transport
The movement of substances across the cell membrane.
Phospholipids
Molecules that make up the cell membrane, consisting of a hydrophilic head and hydrophobic tails.
Phospholipid Bilayer
The arrangement of phospholipids in two layers that make up the cell membrane.
Fluid Mosaic Model
A model that describes the cell membrane as a fluid structure composed of various components such as phospholipids, proteins, carbohydrates, and cholesterol.
Selective Barrier
The cell membrane regulates the movement of materials into and out of the cell, allowing only certain substances to cross.
Selective Transport
The movement of substances across the cell membrane, which is selective and allows only certain particles to pass through.
Impermeable
Refers to a membrane that does not allow anything to pass through.
Permeable
Refers to a membrane that allows all materials to pass through.
Semi-permeable
Refers to a membrane that allows some particles to pass through while excluding others.
Hydrophilic
The phosphate head of a phospholipid molecule that is "water-loving."
Hydrophobic
The lipid tail of a phospholipid molecule that is "water-hating."
Note 
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