Chapter 4 physiological needs 1. what is the difference between a need and a drive? 2. what is the difference between intracellular fluid and extracellular fluid. 3. describe the glucostatic hypothesis. 4. describe the short-term appetite process. (hint: start with liver) 5. describe the lipostatic hypothesis. 6. define set point theory. 7. name four environmental influences of hunger? 8. define sexual scripts. 9. define sexual schemas.