Cell Membranes Osmosis and Diffusion

• Membranes organize a cells activities.
• Membranes regulate the traffic of molecules in and out of the cell.
• Diffusion is the net movement of particles of a substance from where they are more concentrated to where they are less concentrated.
• The goal of diffusion is to reach equilibrium.
• Osmosis passive transport of water across a selectively permeable membrane such as the cell membrane.
• Active transport

Key Topics

• Phospholipid bilayer
• Diffusion
• Equilibrium
• Selectively permeable membrane
• Passive transport
• Facilitated diffusion
• Osmosis
• Hypertonic
• Hypotonic
• Isotonic
• Active transport
• Vesicle
• Exocytosis
• Endocytosis