| A | B | 
| Effector | A structure in the body that can change the value of a variable | 
| Endocytosis | The process by which large molecules are taken into the cell | 
| Exocytosis | Transportation of material from inside the cell to outside the cell | 
| Gross Anatomy | The study of the macroscopic structures of an organism | 
| Histology | The study of tissues | 
| Homeostasis | A state of equilibrium in the body with respect to its functions, chemical levels, and tissues | 
| Microscopic Anatomy | The study of the microscopic structures of an organism | 
| Organ | A group of tissues specialized for a particular function | 
| Physiology | The study of the functions of an organism and its parts | 
| Selective Permeability | The ability to let certain materials in or out while restricting others | 
| Tissues | Groups of cells specialized for a particular function |