THE CELL MEMBRANEEverything You Ought To Know

(aka The Plasma Membrane)

Fluid Mosaic• Not a solid structure• Dynamic• Moveable• Adaptable• Proteins

Video

The Basic Cell Membrane

Phospholipid Bilayer• Phospholipids

• Head – Hydrophilic• Tail – Hydrophobic• Tails Together and Heads Outward

• What does it allow through without energy?• Water, Oxygen, and Carbon Dioxide

• Diffusion• High to Low

Transmembrane Proteins & Selective Permeability

• Large and/or charged particles• Glucose• Sodium ions (charged)

• Gates and channels• Electrical charges

Many Membranes • Mitochondrial membranes• Golgi Apparatus• Nuclear Membrane• Lysosome• Endoplasmic Reticulum