Please explain the following terms:

1. Inventory
2. The Importance of Inventory
3. The different Functions of Inventory
4. The different Inventory costs
5. Blood Inventory Management
6. Reorder Point
7. The Determinants of the Reorder Point
8. Fixed Order Interval Model
9. Single-Period Model
10. ABC Analysis
11. Basic Economic Order Quantity
12. Production Order Quantity
13. Quantity Discount Model