celldiagram.worldBiology · Cell Boundary
Cell Membrane Diagram
This labeled diagram of a cell membrane shows the fluid mosaic model: a phospholipid bilayer with moving proteins, cholesterol and carbohydrate markers.
Interactive vector diagram — click a part, hide labels, or download a 300 DPI PNG / editable SVG.
Diagram labels and functions
| Structure / stage | Function |
|---|---|
| Phospholipid bilayer | Flexible foundation with hydrophilic heads and hydrophobic tails. |
| Channel protein | Hydrophilic passage for selected particles. |
| Carrier protein | Changes shape to move substances across. |
| Cholesterol | Adjusts membrane fluidity and stability. |
| Glycoprotein | Cell recognition and signaling marker. |
The fluid mosaic model
The membrane is fluid because phospholipids and many proteins can move sideways. It is a mosaic because different proteins, lipids and carbohydrate groups are scattered through it.
How substances cross the membrane
Small non-polar molecules diffuse through the bilayer. Ions and many polar molecules need channels or carriers, while active transport uses ATP to move substances against a concentration gradient.
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Frequently Asked Questions
What does a cell membrane diagram show?
It shows a phospholipid bilayer containing transport proteins, cholesterol and carbohydrate-bearing molecules.
Why is the cell membrane partially permeable?
Its hydrophobic interior blocks many substances, while specific proteins permit selected molecules or ions to cross.
What is the fluid mosaic model?
A model describing a flexible lipid bilayer with many different mobile proteins embedded in it.
Search terms covered by this page
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