Membranes

Topic 2.4

2.4.1: Membrane Structure

The the figure below shows the structure of the plasma membrane including phospholipid bilayer, cholesterol, glycoproteins, and integral and peripheral proteins. The term plasma membrane, not the cell surface membrane, is used for the membrane surrounding the cytoplasm. Integral proteins are embedded in the phospholipid bilayer, whereas peripheral proteins are attached to a surface.

Membranes link Membrane animation
Structure of the plasma membrane

2.4.2: How do the hydrophobic and hydrophilic properties of phospholipids maintain cell membrane structure?

Cell membrane stability

2.4.3: Functions of membrane functions

Membrane Functions

2.4.4 - 2.4.6: Membrane transport explained

Diffusion is the passive movement of particles from a region of high concentration to a region of low concentration. Osmosis is the passive movement of water molecules, across a partially permeable membrane, from our region of low solute concentration to a region of high solute concentration.

Membrane Transport Explained

2.4.7: How are vesicles used to transport materials within a cell?

Vesicles are used to transport material within a cell between the rough endoplasmic reticulum, Golgi apparatus and plasma membrane. Place the mouse pointer on numbers 1 to 5 on the figure below for the explanation of how the material is secreted from the cell and 6 to 7 for how a material is taken into a cell.

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Vesicles link Vesicles animation
Endomembrane System in a Cell 1 2 3 4 5 6 7

2.4.8: How membrane fluidity allows for shape change, endocytosis and exocytosis?

Explanation membrane fluidity
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