1. ACTION POTENTIAL
   1. IMPORTANCE
   2. DEFINITION
2. REST POTENTIAL
   1. IMPORTANCE
   2. DEFINITION
3. EXATIBILITY
   1. DEFINITION
   2. IMPORTANCE
4. TRANSPORT MECHANISMS
   1. SIMPLE DIFFUSION
   2. FACILITATED DIFUSION
   3. OSMOSES
   4. ACTIVE TRANSPOR
      1. PRIMARY
      2. SECONDARY
   5. FILTRATION
5. CELL MEMBRANE
   1. STRUCTURE