PLASMA MEMBRANES

1. Fluid Mosaic Model

1.1. Phospholipids and free-moving proteins give the plasma membrane its fluidity

1.2. Scattered, anchored proteins gives the plasma membranes its 'mosaic pattern'

2. Types of Movements

2.1. Diffusion: The passive movement of solutes from a region of high to low concentration

2.2. Osmosis: The passive net movement of free-moving water particles from a region of high to low concentration across a semi-permeable membrane

2.3. Facilitated Diffusion: The passive movement of molecules from a region from high to low concentration with the assistance of protein carriers and channels

2.4. Active Transport: The movement of molecules against the concentration gradient with the assistance of carrier/channel proteins and the usage of ATP

2.5. Bulk Transport: The movement of vesicles across the semi-permeable membrane with the usage of ATP (both in and out of the cell)

2.5.1. Endocytosis: Bulk movement of molecules into the cell

2.5.2. Exocytosis: Bulk movement of molecules out of the cell

3. Structure

3.1. New node