Add Headings and they will appear in your table of contents.
1. Cell injury, Cell Death and Adaptations
2. Inflammation and Repair
3. Hemodynamic Disorders
4. Immune System
5. Neoplasia
6. Genetic and Pediatric Diseases
7. Environmental and Nutritional Diseases
8. Infectious Diseases
9. Blood Vessels
10. Heart
11. Hematopoetic and Lymphoid System
12. Lung
13. Kidney and Collecting Duct system
14. Oral cavity and GIT
15. Liver Gallbladder and Biliary tract
16. Pancreas
17. Male genital System
18. Female Genital System
19. Endocrine System
20. Bone Joints and Soft Tissues
21. Peripheral Nervous System
22. Central Nervous System
23. Skin