1. Cell Membrane
1.1. Composition
1.1.1. Plasmamembrane
1.1.1.1. Made of phospholipids
1.1.1.2. Keeps cytoplasm and cell contents in
1.1.1.3. Semipermeable
1.1.2. Specialized Proteins
1.1.2.1. Recognition Proteins
1.1.2.1.1. Identification tags for cell
1.1.2.1.2. Important for immune system
1.1.2.2. Glycoproteins
1.1.2.2.1. Have attached carbohydrates
1.1.2.3. Receptor Proteins
1.1.2.3.1. React with specific molecules in extracellular fluid
1.1.2.3.2. Cause specific cell response
1.1.2.4. Transport Proteins (channel proteins)
1.1.2.4.1. Regulates the movement of hydrophillic molecules in and out of the cell
1.1.2.4.2. Certain transport proteins are selective for certain ions
1.2. Substance movement
1.2.1. Diffusion
1.2.1.1. Substances move across a concentration gradient
1.2.1.2. Substances move from high concentration to low concentration
1.2.1.2.1. Caused by molecules bouncing on each other
1.2.1.2.2. Stops when equilibrium is achieved
1.2.2. Transport
1.2.2.1. Passive transport
1.2.2.1.1. Simple diffusion
1.2.2.1.2. Facilitated diffusion
1.2.2.1.3. Osmosis
1.2.2.2. Energy requiring transport
1.2.2.2.1. Active transport
1.2.2.2.2. Endocytosis
1.2.2.2.3. Exocytosis