Cell Membrane Structure

The fluid mosaic model describes the structure of the cell membrane. Key points include:

1. Phospholipid bilayer: Forms the basic structure with hydrophilic heads facing outwards and hydrophobic tails inwards.
2. Proteins: Embedded in or attached to the bilayer, serving various functions like transport or recognition.
3. Fluidity: Lipids and proteins can move laterally, giving the membrane a fluid nature.
4. Cholesterol: Present in animal cell membranes, regulates fluidity.
5. Carbohydrates: Attached to some lipids and proteins on the outer surface, involved in cell recognition.

This model explains how the membrane maintains its structure while allowing necessary substances to pass through.