1. what is cell membrane
1.1. permeable
1.1.1. letting some material through but not others
1.2. the surface area
1.2.1. as the cell get smaller, the surface area is larger to volume ratio
1.2.1.1. as the cell get bigger, then the needed of food supplies as well as the metabolic processes and waste going out
1.3. it controlling what passes through them and allowing the fluids to have different composition
2. fluid mosaic model
2.1. fluid
2.1.1. movement. the components are floating and not static
2.2. mosaic
2.2.1. arranges small pieces together and make some larger piece
3. structures
3.1. phospholipids
3.1.1. polar lipids
3.1.2. unsaturated fatty acid
3.1.2.1. makes the proteins move freeliy within membrane
3.1.3. fatty chains are neutral and insoluble in water
3.1.4. contact with water
3.1.4.1. hydrophilic
3.1.4.1.1. the heads (glycerol)
3.1.4.2. hydrophobic
3.1.4.2.1. the tails
3.1.4.3. micelles
3.1.4.3.1. hydrophilic heads point outwards and the hydrophobic tails are hidden inside
3.1.4.4. bilayer
3.1.4.4.1. with water on each side of monolayer, the phospholipids form bilayer
3.1.5. phospholipid bilayer
3.1.5.1. allows fat-soluble organic molecules pass through cell.
3.2. cholesterol
3.2.1. rigid molecule
3.2.1.1. makes the membrane more stable and stronger
3.2.2. acts as effective barrier around cell
3.2.2.1. makes ions and small molecules harder to get in
3.3. proteins
3.3.1. many of this have hydrophobic part
3.3.2. to help substances moves across the membrane
3.3.3. act as specific receptor molecules
3.3.4. glycoprotein
3.3.4.1. carbohydrate prosthetic is conjugated